Valery Koryukin, The space vacuum as the analog of the type I superconductor with respect to weakly interactions
Valery Koryukin
Mari State Technical University
Title: The space vacuum as the analog of the type I superconductor with respect to weakly interactions
Abstract: The last astronomical data do not let to doubt what the Universe is classified among the physical systems the information\`s on which\`s it is impossible to consider the full one. It is precisely therefore the use of standard cosmological model received within the scope of General Relativity adopting the deterministic conception is the hindrance in the future researches. Specifically it is necessary to return the original sense to the mathematical concepts such as the space curvature which\`s must give the estimation of the physical reality rather than must replace it. We shall suppose that the greater part of weakly interacting particles constituting the great background of Universe exist in the degenerate (basic) state inserting the minor contribution in the vacuum polarization for the estimation of which the space curvature is used. Let as a result of some causes the disintegration of the Bose condensate will begin with formation of free fermions and with an increase of a pressure in some local area of Universe (it is possible which coincides with the metagalaxy). An inverse process of relaxation characterized by the formation of the Bose condensate and by the pressure decline should go with an energy release which will go on heating of the Fermi liquid with formation of excited states - of known charged fermions (quarks and leptons). Taking account of the negative result in experiments for the search of Higgs scalar bosons we suggest once again to be returned to the consideration of the mechanism to endow masses on particles. Considering the space vacuum as the analog of the type I superconductor we make the estimation of parameters characterizing the Cooper pairs of Universe weakly interacting particles.
Address: 424000 Yoshkar-Ola sq. Lenin - 3 MarSTU
Acompaing persons: 0
email: koryukin@marstu.mari.ru
Presentation:
talk
poster yes
none
Support:
under35: yes
Comments: As my participation depends on the fact to a considerable extent if I can find the financial support I shall be thankful to Organizing Committee for any help in this problem.
Date: 31.01.06 09:00:27
Vladimir Dogiel, on the origin of annihilation emission from the Galactic center
Vladimir Dogiel
P.N.Lebedev Physical Institute
Title: on the origin of annihilation emission from the Galactic center
Abstract: Both diffuse high energy gamma-rays and a strong and extended electron-positron line emission have been observed in the Galactic Center (GC) Although X-ray observations indicate that the galactic black hole Sgr is in inactive phase we suggest that the Sgr A could still be the source of the high energy emission. We argue that the galactic black could be a powerful source of relativistic protons when it captures a We assume that relativistic protons are injected into the material from the galactic black hole about hundred million years ago after a massive star. In this way we are able to explain the current observed diffuse and the annihilation line spectrum. Annihilation line is produced by secondary positrons whose time of cooling by Coulomb collisions is so large the the intensity of the annihilation line reaches its peak value long after the peak of high energy gamma-ray flux. The required amount of energy is consistent with the estimation of the tidal of a star by a massive black hole. The spatial distribution of the intensity seems to suggest that there may be more than one stellar event in the past.
Address:
Acompaing persons: 1
email: dogiel@lpi.ru
Presentation:
talk yes
poster
none
Support:
under35: yes
Comments: If Russian participants will be supported by the LOC I would like to get this support
Date: 31.01.06 13:03:58
Kuntal Misra, Optical Observations and Multiband Modelling of the Afterglow of GRB 041006
Kuntal Misra
Aryabhatta Research Institute of Observational Sciences (ARIES)
Title: Optical Observations and Multiband Modelling of the Afterglow of GRB 041006
Abstract: We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying \`hard\` electron energy spectrum with a p ~ 1.3. The burst appears to be of very low energy (E ~ 10^48 ergs) confined to a narrow cone of opening angle theta ~ 2.3 deg. The associated supernova id compared with SN 1998bw and is found to be brighter.
Address: Manora Peak Nainital 263 129 India
Acompaing persons: 0
email: kuntal@aries.ernet.in
Presentation:
talk
poster yes
none
Support: yes
under35: yes
Comments: I am a Ph. D. student working in the field of Gamma Ray Bursts. The 6th INTEGRAL workshop will be quite useful for me as it covers GRBs which is of interest to my research work. I will be highly thankful if you waive off the registration fee and provide me travel support to attend the workshop.
Date: 31.01.06 16:58:05
kwong sang cheng, electron/positron annihilation lines from the Galactic Center
kwong sang cheng
University of Hong Kong
Title: electron/positron annihilation lines from the Galactic Center
Abstract: A strong and extended electron-positron line emission have been observed in the Galactic Center (GC) Although X-ray observations indicate that the galactic black hole Sgr is in inactive phase we suggest that the Sgr A$^*$ could still be the source of the high energy emission. We argue that the galactic black could be a powerful source of relativistic protons when it captures a Consequently a transient active galactic nuclear will be activated when capture star is tidally disrupted and matter is accreted into the black In this talk we assume that relativistic protons are injected into the material from the galactic black hole several million years ago after a massive star we are able to explain the current observed diffuse and the very detailed annihilation line spectrum. The required amount of energy is consistent with the estimation of the tidal of a star by a massive black hole. The spatial distribution of the intensity seems to suggest that there may be more than one stellar event in past several million years. In particular the model fitting that a star with mass several $\\sim 10M_\\odot$ should be captured in million years ago and stars with typical mass several $\\sim M_\\odot$ should captured more frequently in a time scale of several hundred thousand years. capture of the lower mass star may be able to account for the recent TeV within 10 pc of the galactic center. The spectral difference GeV flux and TeV flux could be explained naturally in this model as
Address: Pokfulam road Hong Kong China
Acompaing persons: 0
email: hrspksc@hkucc.hku.hk
Presentation:
talk yes
poster
none
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Date: 02.02.06 06:56:28
Manjari Bagchi, Strange star properties with a medium dependence in gluons at finite
Manjari Bagchi
Presidency College
Title: Strange star properties with a medium dependence in gluons at finite
Abstract: The possible existence of strange stars in the universe will help in the understanding of various properties of quantum chromodynamics like asymptotic freedom and chiral symmetry restoration which is otherwise very difficult to prove in laboratory experiments. Strange star properties are calculated using large color approximation with built-in chiral symmetry restoration. A relativistic Hartree Fock calculation is performed using a modified and improved Richardson potential as an interquark interaction. This potential has the asymptotic freedom and a confinement-deconfinement mechanism built into it. The effect of temperature on gluon mass in a simple way in addition to the usual density dependence. We obtained a set of new equation of states for strange quark matter and also found that the transition temperature from hadronic matter to strange matter is at 80 MeV close to the 100 MeV estimated in literature.
Address: 86/1 College Street Kolkata 700073 West Bengal India
Acompaing persons: 0
email: mnj2003@vsnl.net
Presentation:
talk yes
poster
none
Support: yes
under35: yes
Comments: I am a Ph.D student and my institute has no fund allocated for supporting students to participate in an international conference. So if I need travel support from the organisers.
Date: 02.02.06 21:28:36
Jaykovf Foukzon, Non classical Black Holes with singularity horizon.
Jaykovf Foukzon
Israel Institution of Tech.
Title: Non classical Black Holes with singularity horizon.
Abstract: classical Black Holes with horizon. Institution of Tech. aguidance@excite.com
Address:
Acompaing persons: 1
email: aguidance@excite.com
Presentation:
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poster yes
none
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Comments:
Date: 03.02.06 18:31:33
Alexander Potekhin, Envelopes of neutron stars with strong magnetic fields
Alexander Potekhin
Ioffe Physico-Technical Institute
Title: Envelopes of neutron stars with strong magnetic fields
Abstract: Neutron star crust and ocean provide thermal insulation the stellar interior and control thus the thermal evolution neutron stars while the outermost surface layers which can partially ionized control the spectrum of emitted thermal radiation. magnetic fields can profoundly modify thermodynamic and characteristics of matter (e.g. the equation of state and and thermal electron opacities) in the envelopes thereby affect the link between stellar parameters and observations. review the theory of these effects putting emphasis on differences and theoretical problems brought about the superstrong magnetic fields of magnetars. work is supported by RFBR Grants 05-02-16245 and 05-02-22003.
Address: Politekhnicheskaya 26 194021 St.Petersburg Russia
Acompaing persons: 0
email: palex@astro.ioffe.ru
Presentation:
talk yes
poster
none
Support: yes
under35:
Comments:
Date: 06.02.06 07:17:46
Samir Mandal, Spectral fit of Cygnus X-1 in high energies --- a self-consistant study
Samir Mandal
Senior Research Fellow
Title: Spectral fit of Cygnus X-1 in high energies --- a self-consistant study
Abstract: We have fitted the observational spectrum of Cygnus X-1 by a model flow which includes standing shocks. This model self-consistantly explains the transition between hard and soft states as well as the origin of high energy power-law spectrum in Mev range. We have used the fact that the shocks may accelerate electronsto a non-thermal distribution which in turn produce power-law synchrotron photons in presence of magnetic field. We incorporated inverse-Comptonization of these photons to generate the self-consistent spectrum.
Address: Centre for Space Physics 43 Chalantika Garia Station Road Kolkata 700084 India
Acompaing persons: 0
email: samir@csp.res.in
Presentation:
talk yes
poster
none
Support: yes
under35: yes
Comments: I am a Ph.D. student of Prof. Sandip K. Chakrabarti and have submitted my thesis in September 2005. I am seeking Pdf positions and would be very happy if I am given opportunity to attend this important conference and if I am allowed to present my work in high energy astrophysics. I seek the waiver of the registration fee local hospitality and at least half the travel expenses.
Date: 07.02.06 17:14:25
Dmitry Yakovlev, Strange or even stranger stars
Dmitry Yakovlev
Ioffe Physical Technical Institute
Title: Strange or even stranger stars
Abstract: Strange or even stranger stars Yakovlev (1) and P. Haensel (2) Ioffe Physical Technical Institute 26 194021 Saint-Petersburg Russia Copernicus Astronomical Center 18 PL-00-716 Warsaw Poland describe the basic physical principles underlying the hypotheses the existence of strange quark matter or more exotic of matter in the cores of compact stars or even at the of these stars. We review then the main parameters of compact stars such as strange stars or even stranger (particularly Q-stars). We formulate observational tests would enable one to confirm or reject the hypotheses on existence of these objects and compare theoretical predictions results of present observations.
Address: Politekhnicheskaya 21 194021 Saint-Petersburg Russia
Acompaing persons: 0
email: yak@astro.ioffe.ru
Presentation:
talk yes
poster
none
Support:
under35:
Comments: I would be grateful if my registration fee were reduced
Date: 07.02.06 18:11:11
Christoph Winkler,
Christoph Winkler
ESA-ESTEC
Title:
Abstract:
Address: Keplerlaan 1 NL-2201 AZ Noordwijk The Netherlands
Acompaing persons: 0
email: Christoph.Winkler@rssd.esa.int
Presentation:
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poster
none yes
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under35:
Comments:
Date: 13.02.06 16:34:51
Jerome Rodriguez, An integral monitoring of GRS 1915+105: simultaneous observations with INTEGRAL RXTE The Ryle
Jerome Rodriguez
CEA Saclay SAp
Title: An integral monitoring of GRS 1915+105: simultaneous observations with INTEGRAL RXTE The Ryle
Abstract: Since the launch of INTEGRAL in late 2002 we monitor the microquasar GRS 1915+105 with long exposure ks) pointings. the observations have been conducted simultaneously other instruments in particular RXTE the Ryle and GMRT but in some cases also with others Nançay Suzaku ...). report here the main results of these three years of focusing on the X-ray behaviour of the source as seen by INTEGRAL RXTE: of variability term evolution and temporal properties focusing on particularly interesting observations The radio-X-ray connection: of ejection of material with the X-ray behaviour monitoring shows the importance of long uninterrupted accompanied by multiwavelength coverage. discuss our findings in the context of accretion-ejection models.
Address: CEA Saclay DSM/DAPNIA/SAp Orme des Merisiers Bat 709 F-91191 Gif Sur Yvette Cedex FRANCE
Acompaing persons: 0
email: jrodriguez@cea.fr
Presentation:
talk yes
poster
none
Support:
under35:
Comments: Authors are: J. Rodriguez D.C. Hannikainen G. Pooley G. Krishna T. Belloni S.E. Shaw M. Cadolle-Bel O. Vilhu
Date: 13.02.06 18:49:29
Olugbenga Latinwo, Gamma Ray Bursts; An Historical Overview of its Origin
Olugbenga Latinwo
Ladoke Akintola University of Technology
Title: Gamma Ray Bursts; An Historical Overview of its Origin
Abstract: History and overview of the origins of Gamma-ray bursts are presented.The phenomenon of Gamma Ray Bursts(GRB) are sudden releases of energy that in the space of a few seconds can outshine a huge galaxy of billions of stars although they almost certainly come from a tiny region of space infinitesimal compared to a galaxy. Till contemporary times astronomers have debated where these bursts come from. Numerous theoretical physicists and astrophysicists have however debated with concrete explanations whether the bursts come from the local or \`galactic\`theory or from very distant space (the extragalactic or \`cosmological\` theory). quarters propose the bursts come from small black holes or colliding neutron stars in young faraway galaxies other findings indicate they originate from the vicinity of giant supermassive black holes in the centers of quasars or related objects. Moreover others even propose that some may come from \`evaporating\` black holes that may have existed shortly after the Big Bang. These are vital debateable theories proposed from miscellaneous institutions. then can cause GRB`S? It is however humbling to think that even 25 years and more than 3400 technical papers origins of bursts is still a hot topic to be x-rayed.
Address: Faculty of Pure and Applied Sciences Department of Pure and Applied Physics. G.P.O Box 1490 Ogbomoso Oyo State Nigeria.
Acompaing persons: 0
email: ckgbenga@yahoo.co.uk
Presentation:
talk yes
poster
none
Support: yes
under35: yes
Comments: I wonder if a poster can be added to my oral presentation(Two contributions)
Date: 14.02.06 14:27:09
Wei Wang, SPI observations of 60Fe lines in the Galaxy
Wei Wang
Mr.
Title: SPI observations of 60Fe lines in the Galaxy
Abstract: Following its detection of the gamma-ray lines at 1173 and 1333 keV from 60Fe in data obtained during its first year the SPI on board INTEGRAL has accumulated two further years\` worth of data. We have analyzed these data obtaining a more precise measurement of the flux in both two lines ($4\\pm 1.6 \\times 10^-5 ph cm^-2 s^-1 per line) which is in agreement with our earlier result. We discuss the implications of these results for the widely-held hypothesis that 60Fe is synthesized in core-collapse supernovae and for the closely-related question of the precise origin of 26Al in massive stars.
Address: Max-Planck Institute for Extraterrestrial Physics Giessenbachstrasse 1 85741 Garching Germany
Acompaing persons: 0
email: wwang@mpe.mpg.de
Presentation:
talk yes
poster
none
Support: yes
under35: yes
Comments: Better results would be obtained when the workshop is near. The abstract may be revised.
Date: 17.02.06 12:33:08
Mikhail Revnivtsev, Origin of the Galactic ridge X-ray emission: puzzle solved?
Mikhail Revnivtsev
IKI Moscow; MPA Garching
Title: Origin of the Galactic ridge X-ray emission: puzzle solved?
Abstract: Origin of the Galactic ridge X-ray emission (GRXE) was a long standing problem of X-ray astronomy. Explainations of the ridge emission by emission of a hot thermal plasma or by interaction of cosmic rays with interstellar matter were connected with serious problems. Latest studies of the ridge emission with highest sensitivity X-ray telescopes (like CHANDRA) have not provided conclusive answer. We have studied the morphology of the Galactic ridge X-ray emission with Rossi Explorer and showed that the GRXE contains both disk and bulge/bar components which parameters very well agree with those of known stellar Galactic components. We have showed that the GRXE volume emissivity well traces the stellar mass density in the Galaxy. Average Galactic unit stellar mass emissivity of the GRXE can be easily explained by average unit stellar mass X-ray emissivity in the Solar neighbourhood. Dominant contributors to the GRXE are accreting white dwarfs and coronally active stars. Weighted spectrum of known types of sources well agree with the spectrum of GRXE in the energy band 3-100 keV.
Address:
Acompaing persons: 0
email: mikej@hea.iki.rssi.ru
Presentation:
talk yes
poster
none
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under35:
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Date: 17.02.06 16:23:57
Diego Gotz, INTEGRAL and Magnetars
Diego Gotz
SAP/CEA
Title: INTEGRAL and Magnetars
Abstract: Thanks to INTEGRAL long exposures of the Galactic Plane the two brightest Soft Gamma-Ray Repeaters SGR 1806-20 and SGR 1900+14 have been monitored and studied in detail for the first time at hard-X/soft-gamma rays. 1806-20 lying close to the Galactic Centre and being very active in the past two years has provided a wealth of new INTEGRAL results which we will review here: more than 300 short bursts have been observed from this source and their characteristics have been studied with unprecedented sensitivity in the 15-200 keV range. A hardness-intensity anticorrelation within the bursts has been discovered and the overall Number-Intensity of the bursts has been determined. The increase of its explosive activity eventually led to the December 2004 Giant Flare for which a possible soft gamma-ray (>80 keV) early afterglow has been detected with INTEGRAL. The deep observations allowed us to discover the persistent emission in hard X-rays (20-150 keV) from 1806-20 and 1900+14 the latter being in quiescent state and to directly compare the spectral characteristics of all Magnetars (two SGRs and three Anomalous X-ray Pulsars) detected with INTEGRAL.
Address: Orme des Merisiers Bat. 709 91191 Gif sur Yvette France
Acompaing persons: 0
email: diego.gotz@cea.fr
Presentation:
talk yes
poster
none
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Date: 17.02.06 17:12:26
Mikhail Pavlinsky, `Spectrum-RG/eROSITA/Lobster` astropysical mission
Mikhail Pavlinsky
Space Research Institute RAS
Title: `Spectrum-RG/eROSITA/Lobster` astropysical mission
Abstract: High particle background on high apogee orbits severely affects the capabilities of X-ray telescopes to study diffuse emission. For new baseline configuration of the SRG mission a low earth orbit was selected to circumvent this limitation. A medium size satellite will be launched in the 2009-2010 timeframe into a 600 km equatorial (<4 deg.) orbit from Kourou or into a 29 deg. orbit from Baikonur as a fallback option. The payload includes eROSITA (extended ROentgen Survey with an Imaging Telescope Array MPE Germany) with 7 Wolter-type telescopes the wide field X-ray monitor (LU UK) and ART telescopes (IKI Russia). The mission will conduct the first all-sky survey with an imaging telescope in the 2-12 keV band to discover the hidden population of several hundred thousand obscured supermassive black holes and the first all-sky imaging X-ray time variability survey. In addition to the all-sky surveys it is foreseen to observe the extragalactic with high sensitivity to detect 50 to 100 thousand clusters of galaxies and thereafter to do follow-up pointed observations of selected sources in order to investigate the nature of Dark Matter and Dark Energy. The new SRG mission would thus be a highly significant scientific and technological step beyond and would provide important and timely inputs for the next generation of giant X-ray observatories like XEUS/Con-X planned for the 2015-2025 horizon.
Address: Profsouznaya 84/32 Moscow Russia
Acompaing persons: 0
email: pavlinsky@hea.iki.rssi.ru
Presentation:
talk
poster yes
none
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Date: 21.02.06 15:23:32
Maria Emilia De Rossi, To be confirmed
Maria Emilia De Rossi
Institute for Astronomy and Space Physics
Title: To be confirmed
Abstract: To be confirmed
Address: CC 67 - Suc 28 (1428)
Acompaing persons: 0
email: maribblue@hormail.com
Presentation:
talk
poster yes
none
Support: yes
under35: yes
Comments:
Date: 21.02.06 21:58:17
Maria Emilia De Rossi, To be confirmed
Maria Emilia De Rossi
Institute for Astronomy and Space Physics
Title: To be confirmed
Abstract: To be confirmed
Address: CC 67 - Suc 28 (1428)
Acompaing persons: 0
email: maribblue@hormail.com
Presentation:
talk
poster yes
none
Support: yes
under35: yes
Comments: I am doing my PhD with Dr. Patricia Tissera. I am studying fundamental relationships between galaxy properties by using numerical simulations in a cosmological framework.
Date: 21.02.06 22:01:26
Nuria Lorena Abigail Ganopol, To be confirmed
Nuria Lorena Abigail Ganopol
Institute for Astronomy and Space Physics
Title: To be confirmed
Abstract: To be confirmed
Address: CC 67 - Suc 28 (1428)
Acompaing persons: 0
email: abigail@iafe.uba.ar
Presentation:
talk
poster yes
none
Support: yes
under35: yes
Comments: I am working under the supervision of Dr. Patricia Tissera. I am focusing on the evolution of galaxy properties during merger events by using hydrodynamical numerical simulations.
Date: 21.02.06 22:08:03
Vyacheslav Dokuchaev, Dark matter annihilation in the Galaxy
Vyacheslav Dokuchaev
Institute for Nuclear Research of the Russian Academy of Sciences
Title: Dark matter annihilation in the Galaxy
Abstract: The annihilation of dark matter in the Galactic halo is enhanced due to the presence of small-scale dark matter clumps. It is described the formation and tidal destruction of small-scale dark matter clumps in the the standard cosmological scenario with an inflationary-produced primordial fluctuation spectrum and with a hierarchical clustering of small clumps into the larger ones. The small-scale clumps are efficiently disrupted at early stages of structure formation starting from the time of clump detachment from the universe expansion. Only a small fraction of these clumps 0.1-0.5% survives the stage of hierarchical clustering. The survived clumps can be further destructed in the galaxies by tidal interactions with stars in the Galactic bulge disk and halo. The dominant contribution to the clump destruction is shown to be given by the collective gravitational field of the Galactic disc. The resulting enhancement (boost factor) of annihilation signal due to the halo clumpiness strongly depends on the primordial perturbation spectrum and varies in the range 10-100.
Address: Prospect 60-letiya Oktyabrya 7a 117312 Moscow
Acompaing persons: 0
email: dokuchaev@inr.npd.ac.ru
Presentation:
talk yes
poster
none
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Date: 22.02.06 11:17:24
Fedorova Elena, High amplification events and gravitational lens system parameters
Fedorova Elena
Kiev State University Astronomical Observatory
Title: High amplification events and gravitational lens system parameters
Abstract: We analyze a reliability of gravitational lens system (GLS) parameters estimation on photometric data in High Amplification Events (HAE). We show that the linear caustic approximation frequently used for HAE analysis typically has an accuracy of ~20%. We also obtain modified formulae for amplification of a source image near a critical curve (next approximation in powers of source size). evaluate the GLS parameters from OGLE (Optical Gravitational Lens Experiment) photometric data on images of a quasar in GLS “Einstein Cross” during 1997-2005 using different brightness distributions. During that time at least four HAE’s had been observed by OGLE in this GLS. These observational data are compatible with the hypothesis of caustic fold crossing but they do not allow to make a choice between different brightness profiles (only to estimate an upper bound of the minor semi axis in the elliptic source model).
Address: 04053 Ukraine Kiev Observatorna st. 3
Acompaing persons: 0
email: elena_f@mail.univ.kiev.ua
Presentation:
talk
poster yes
none
Support: yes
under35: yes
Comments:
Date: 23.02.06 10:07:14
Erik Kuulkers, An unshrouded view of our lively Galactic Bulge
Erik Kuulkers
ISOC ESAC/ESA
Title: An unshrouded view of our lively Galactic Bulge
Abstract: The Galactic Bulge region is a rich host of variable high-energy and gamma-ray point sources. These sources include bright relatively faint X-ray transients X-ray bursters persistent neutron star black-hole candidate binaries high-mass X-ray binaries etc.. We have program to monitor the Galactic Bulge region regularly and frequently with gamma-ray observatory INTEGRAL. As a service to the scientific the high-energy light curves of sources present are made through the WWW. We show the preliminary results of this new program.
Address: Apartado 50727
Acompaing persons: 0
email: ekuulker@rssd.esa.int
Presentation:
talk yes
poster
none
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Date: 23.02.06 12:18:57
Tugay Anatoliy, Researches of Centaurus X-3 pulsar in Kyiv
Tugay Anatoliy
Taras Shevchenko Kyiv University Faculty of Physics Astronomy and Space Physics Department
Title: Researches of Centaurus X-3 pulsar in Kyiv
Abstract: Within the work of recently open \`Integral\` data-processing centre SPI spectra of x-ray pulsar Centaurus X-3 have been analysed. We searched for nuclear lines and dependence of spectrum parameters from the eclipse phase. The model of Cen X-3 MeV-range emission based on inverse compton scattering cascades is discussed.
Address: 03022 Ukraine Kyiv Glushkova avenue 2
Acompaing persons: 0
email: tugay@univ.kiev.ua
Presentation:
talk yes
poster
none
Support: yes
under35: yes
Comments:
Date: 23.02.06 14:57:34
William GILLARD, Transport of positrons in the interstellar medium
William GILLARD
C.E.S.R
Title: Transport of positrons in the interstellar medium
Abstract: The spectral analysis of the positron-electron annihilation based on measurements made with the spectrometer SPI of the INTEGRAL observatory indicates that positrons annihilate mainly in the warm medium including the warm ionized and the warm neutral medium (Churazov et al. 2005 ; Jean et al. 2006). In contrast the high filling factor of the hot medium in the central regions of the Galaxy suggests an e+/e- annihilation taking place mainly in the hot medium. This difference can be explained if positrons propagate in the interstellar medium and can escape the hot medium (Jean et al. 2006). The transport of positrons is also comforted by the production processes producing high-energy positrons (>1 MeV) with long-lived times before annihilation favorable to their diffusion. We then present the possible processes of transport for both cosmic-ray positrons at high energy (E >> 1 MeV) and positrons produced by the beta+ decay of radioactive nuclei at lower energy (E ~ 1 MeV). We also describe the diffusive processes of positrons during their cooling phase and during their thermalized phase before they annihilate with electrons.
Address: 9 avenue du Colonel Roche - 31028 TOULOUSE
Acompaing persons: 0
email: gillard@cesr.fr
Presentation:
talk
poster yes
none
Support: yes
under35: yes
Comments: Poster presentation mades in collaboration with Jean (CESR) Marcowith(CESR) Katia Ferrière (LATT)
Date: 23.02.06 18:56:06
Ignacio Negueruela, Characterization of Supergiant Fast X-ray Transients as a class
Ignacio Negueruela
University of Alicante
Title: Characterization of Supergiant Fast X-ray Transients as a class
Abstract: INTEGRAL is finding large numbers of fast transients. We have shown that at least a significant fraction of them are associated with OB supergiants (SFXTs). ongoing observational campaign on SFXTs with a range of space and ground telescopes including the VLT has allowed us to identify new counterparts and derive their astrophysical parameters. We will present new data on the counterparts to SFXT and derive their distances and X-ray luminosities. With these new data we will be ready to start characterizing the class of SFXTs.
Address: DFISTS EPSA Universidad de Alicante PO Box 99 E03080 Alicante Spain
Acompaing persons: 1
email: ignacio@dfists.ua.es
Presentation:
talk yes
poster
none
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Date: 24.02.06 01:00:18
Volker Beckmann, The hard X-ray luminosity function of INTEGRAL detected AGN
Volker Beckmann
NASA Goddard Space Flight Center
Title: The hard X-ray luminosity function of INTEGRAL detected AGN
Abstract: We have compiled a complete significance limited sample based on ~25 000 square degrees to a limiting flux of 3E-11 ergs/cm**2/sec (~7 000 square degrees to a flux limit of 1E-11 ergs/cm**2/sec) in the 20-40 keV band with INTEGRAL. We have constructed a detailed exposure map to compensate for effects of non-uniform exposure. The flux-number relation is best described by a power-law with a slope of 1.66 +- 0.11.
Address: Code 661 Exploration of the Universe Division Greenbelt MD 20770 USA
Acompaing persons: 0
email: beckmann@milkyway.gsfc.nasa.gov
Presentation:
talk yes
poster
none
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Date: 25.02.06 01:10:08
Jürgen KNÖDLSEDER, GRI: The Gamma-Ray Imager mission
Jürgen KNÖDLSEDER
Centre d\`Etude Spatiale des Rayonnements
Title: GRI: The Gamma-Ray Imager mission
Abstract: Observations of the gamma-ray sky reveal the most powerful sources and the most violent events in the Universe. While at lower wavebands the observed emission is generally dominated by thermal processes the gamma-ray sky provides us with a view on the non-thermal Universe. Here particles are accelerated to extreme relativistic energies by mechanisms which are still poorly understood and nuclear reactions are synthesizing the basic constituents of our world. Cosmic accelerators and cosmic explosions are major science themes that are addressed in the gamma-ray regime. the INTEGRAL observatory ESA has provided a unique tool to the astronomical community and has put Europe in the lead in the field of gamma-ray astronomy. INTEGRAL provides an unprecedented survey of the soft gamma-ray sky revealing hundreds of sources new classes of objects views of antimatter annihilation in our Galaxy and fingerprints of recent nucleosynthesis processes. INTEGRAL has provided the global overview over the soft gamma-ray sky there is a growing need to perform deeper more focused investigations of gamma-ray sources. In soft X-rays a comparable step was taken going from the Einstein satellite to the XMM/Newton observatory. Technological advances in the past years in the domain of gamma-ray focusing using Laue diffraction and multilayer-coated mirror techniques have paved the way towards a gamma-ray mission providing major improvements compared to past missions regarding sensitivity and angular resolution. Such a future Gamma-Ray Imager will allow to study particle acceleration processes and explosion physics in unprecedented detail providing essential clues on the innermost nature of the most violent and most energetic processes in the Universe.
Address: 9 avenue Colonel-Roche 31000 Toulouse FRANCE
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email: knodlseder@cesr.fr
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Date: 27Feb06 12:26:44
Jürgen KNÖDLSEDER, Imaging the Gamma-Ray sky with SPI
Jürgen KNÖDLSEDER
Centre d\`Etude Spatiale des Rayonnements
Title: Imaging the Gamma-Ray sky with SPI
Abstract: The spectrometer SPI on INTEGRAL allows for the first time simultaneous imaging of diffuse and point-like emission in the hard X-ray and soft gamma-ray regime. To fully exploit the capabilities of the instrument we implemented the MREM image deconvolution algorithm initially developed for COMPTEL data analysis to SPI data analysis. We present the performances of the algorithm and apply it to produce allsky maps of continuum and gamma-ray line emission throughout the accessible energy range.
Address: 9 avenue Colonel-Roche 31000 Toulouse FRANCE
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email: knodlseder@cesr.fr
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Date: 27Feb06 13:56:12
Werner Collmar, Multifrequency Observations of the Blazar 3C 279 centered on an INTEGRAL ToO Pointing in 2006
Werner Collmar
MPE
Title: Multifrequency Observations of the Blazar 3C 279 centered on an INTEGRAL ToO Pointing in 2006
Abstract: W. Collmar M. Ajello E. Bottacini V. Burwitz (MPE Garching Germany) Boettcher (Ohio Univ. Athens USA) Courvoisier (ISDC Geneva Switzerland) Krichbaum (MPIfR Bonn Germany) Kretschmar (ESA Villafranca Spain) Pottschmidt (UCSD San Diego USA) Sillanpaeae (Tuorla Obs. Piikkioe Finland) Tornikoski (Metsaehovi Radio Obs. Kylmaelae Finland) Villata (Obs. of Torino Torino Italy) prominent Gamma-Ray blazar 3C 279 was observed by INTEGRAL a ToO observation triggered by an optical high-state a total of 511 ksec between January 13 and 22 2006 in pointings. Centered on the INTEGRAL observations multifrequency campaign was organized which yielded simultaneous in radio and mm-bands (e.g. Effelsberg IRAM) in near-IR and optical bands by a WEBT-campaign in X-rays by Chandra and Swift. analysis of the multifrequency data is currently in progress. will present first results of this campaign focusing the results of INTEGRAL in the hard X-ray band on the observed multifrequency spectrum. These 2006 high-state will be compared to the ones derived during an optical of 3C 279 in June 2003 (Collmar et al. 2004). implications on blazar physics will be discussed.
Address: Giessenbachstr. 85748 Garching Germany
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email: wec@mpe.mpg.de
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Date: 27Feb06 14:21:27
Anatol Cherepashchuk, INTEGRAL observations of SS433: Analysis of precessional and orbital hard X-ray periodicities.
Anatol Cherepashchuk
Sternberg Astronomical Institute
Title: INTEGRAL observations of SS433: Analysis of precessional and orbital hard X-ray periodicities.
Abstract: Results of long-term monitoring of SS433 by INTEGRAL in 2003-2005 presented. Several new features of the observed precessional and light curve of SS433 are particulary discussed. The amplitude to minimum flux ratio) of precessional light curve in 20-60 keV is found to be (much higher than in the standard X-ray band 2-10 keV) the secondary maximum present. An orbital eclipse observed precessional phase 0 coincides with the optical one while that at the phase 0.22 is found to be shifted with respect to the eclipse. These features are described by the geometrical model thick supercritical accretion disk and jet from the central source. analysis of the INTEGRAL data allows us to put constraints on parameters of SS433 and lends further support that SS433 is galactic microquasar with black hole.
Address: 119992 Universitetskij pr. 13 Mosvcow
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email: cher@sai.msu.ru
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Date: 27Feb06 15:23:47
Miguel Torrejon, The optical counterpart to the High Mass X-ray Binary IGR J11435-6109
Miguel Torrejon
University of Alicante
Title: The optical counterpart to the High Mass X-ray Binary IGR J11435-6109
Abstract: We present here a characterization of the optical counterpart to the High Mass X-ray Binary of the newly discovered source IGR J11435-6109. The star is a B3Ve star which renders it the Galactic Be/X-ray binary with the latest spectral type known to date.
Address: Ap correos 99
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email: jmt@dfists.ua.es
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Date: 27Feb06 16:05:43
Ken Watanabe, Simulations of the SPI Earth Observation
Ken Watanabe
NASA/GSFC
Title: Simulations of the SPI Earth Observation
Abstract: We have made simulation studies of the Earth Albedo from the Cosmic X-ray Background (CXB) in the energy range of 10 keV to 1 MeV by utilizing the MGEANT package. Our Earth atmosphere model has the e-folded density profile with the scale height of 7 km. We calculated the reflection coefficient of CXB. We also employed the SPI mass model to study its response to the CXB and earth occultation. We discuss our findings in detail.
Address: NASA/GSFC Code 661 Greenbelt MD 20771 USA
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email: watanabe@lheapop.gsfc.nasa.gov
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Date: 27Feb06 18:47:37
Vitaliy Bogomolov, The Image Reconstruction Modeling in the Space Experiment with Wide-Field Gamma-Ray Telescope with the Use of INTEGRAL Sky Maps
Vitaliy Bogomolov
Skobeltsyn Institute of Nuclear Physics Moscow State University
Title: The Image Reconstruction Modeling in the Space Experiment with Wide-Field Gamma-Ray Telescope with the Use of INTEGRAL Sky Maps
Abstract: The Image Reconstruction Modeling in the Space Experiment with Wide-Field Gamma-Ray Telescope with the Use of INTEGRAL Sky Maps. M.I. Bogomolov V.V. Morozov O.V. Svertilov S.I. The INTEGRAL sky maps were used for the simulations of the image reconstruction in the space experiment with a wide field (up to ~2 \\pi sr) coding mask telescope elaborated for the all-sky monitoring in gamma-rays (0.05-1.0 MeV). The experiment with such telescope will have angular resolution about 2-3 degrees. Such resolution is enough for the study of the galactic and extragalactic variable sources transients and gamma-ray bursts in soft gamma rays. The sky maps calculated with the use of INTEGRAL sky maps allow us to estimate the final capabilities of the proposed experiment. One can also consider the expected observation conditions for each of the known galactic and extragalactic sources.
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email: vit_bogom@nm.ru
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Date: 27Feb06 19:54:54