... In the context of assessing and characterizing structures in X-ray images, we compare different approaches. The intensity level is often very low and necessitates a special treatment of Poisson statistics. ... Finally, using a set of ROSAT HRI deep pointings, the presence of small-scale structures in the central regions of clusters of galaxies is investigated. ... Hence, WT has been used for clusters and subclusters analysis (Slezak et al. ...

Еще в разделе: (Показать все результаты (>1996) - www.adass.org/ )

• Spatial Structure of NGC 6822: An Example for Statistical Modeling of
• Object Detection Using Multi-Resolution Analysis
• Noise Detection and Filtering using Multiresolution Transform Methods

... Structure Detection in Low Intensity X­Ray Images using the Wavelet Transform Applied to Galaxy Cluster Cores Analysis Jean­Luc Starck and Marguerite Pierre CEA/DSM/DAPNIA F­91191 Gif­sur­Yvette cedex Abstract. ... Multi­resolution filtering methods based on the wavelet coe#cients detection are also discussed. Finally, using a set of ROSAT HRI deep pointings, the presence of small­scale structures in the central regions of clusters of galaxies is investigated. ... 1995; Rosati et al. ... 1996). ...

Еще в разделе: (Показать все результаты (>267) - www.stecf.org/ )

• http://www.stecf.org/conferences/adass/adassVII/reprints/pagliaroa.ps.gz

... Posts tagged ?spatial statistics? ... As a part of exploring spatial distribution of particles/objects, not to approximate via Poisson process or Gaussian process (parametric), nor to impose hypotheses such as homogenous, isotropic, or uniform, various nonparametric methods somewhat dragged my attention for data exploration and preliminary analysis. ... I decide to discuss Kalman Filter a while ago for the slog after finding out that this popular methodology is rather underrepresented in astronomy. ...

Еще в разделе: (Показать все результаты (>3353) - hea-www.harvard.edu/ )

• *qpspec* - Extraction of Photon Distributions from QPOE files
• The AstroStat Slog clusters
• Notes on IPC and PSPC Spectral Fitting

Program Number . ... Gordon Drukier, Yale University . Shooting Stars: Looking for Direct Evidence of Massive Central Black Holes in Globular Clusters . Abstract . ... Hubble Heritage Observations of Arp 148 . ... The Sloan Digital Sky Survey (SDSS) has proven a powerful tool for identifying new lens candidates, although high angular resolution HST observations are essential for confirming those candidates as genuine gravitational lensing systems (see Program GO 10886). ... Past weeks: . ...

Еще в разделе: (Показать все результаты (>20140) - www.stsci.edu/ )

• HST this week: 259
• Hubble Space Telescope Observations of Globular Clusters in M87 and an Estimate
• HST this week

... 2.3 Establishing the Extragalactic Distance Scale . ... 2.3.2 The Second Rung: Distances to stellar clusters . ... 2.3.4 Distances to Local Group Galaxies . ... The Luminosity Function of Planetary Nebulae . ... 3.2.2 Clusters of Galaxies . ... 4.2 Evidence for Dark Matter as a Function of Scale Size . ... 4.3 Other Dark Matter Indicators for Galaxies . ... What is the nature of the large-scale distribution of matter in the universe as traced by the three-dimensional galaxy distribution? ...

Еще в разделе: (Показать все результаты (>436) - zebu.uoregon.edu/ )

• Evidence for Dark Matter
• Radiation Dominance in the Early Universe
• Astronomy HyperText Book: Stellar Clusters

... Астронет | ... The formation of chemical peculiarities in stellar atmospheres . ... Asymmetry in the variability of radio sources towards the centre and anti-centre of the galaxy . ... Mathematical methods in studying the structure and dynamics of gravitating systems . ... Mathematical methods in studying the structure and dynamics of gravitating systems: Preface . ... On the astronomical applications of the dynamics of hierarchical systems . ... Dynamics of gaseous disks of spiral galaxies . ...

Еще в разделе: (Показать все результаты (>101308) - www.astronet.ru/ )

• The Hydra Cluster of Galaxies
• XWare > APOD

Clusters of Galaxies and Large-Scale Structure ** . ... Kopylov, A. I.; Kopylova, F. G. Structure of galaxy groups and clusters measurment of their masses . ... Kopylova, F. G.; Kopylov, A. I. Pecular motions of galaxy clusters and groups in the Hercules and Leo supercluster regions . ... Kopylova, F. G.; Kopylov, A. I. Analysis of the properties of clusters of galaxies in the region of the Ursa Major supercluste . ... Kopylova, F. G.; Kopylov, A. I. The Ursa Major Supercluster of Galaxies: II. ...

Еще в разделе: (Показать все результаты (>282) - mavr.sao.ru/ )

• articles_flera_en

... Primordial theory review : Dick Bond . Defects and the CMB review : Andy Albrecht . ... Gravitational wave contribution to CMB anisotropies : V.B. Lukash and E.V. Mikheeva . C_l from cosmic strings : Lloyd Knox . Some aspects of CMB anisotropies induced from topological defects : Mairi Sakellariadou . ... CMB anisotropies from scaling sources : Ruth Durrer . ... SZ observations I : Sarah Church . ... Holes in the microwave sky? ... Detecting cosmic strings in the CMB : James Robinson . ...

Еще в разделе: (Показать все результаты (>2012) - www.mrao.cam.ac.uk/ )

• Astrophysics Group Cosmic Microwave Background (CMB)
• Astrophysics Group AMI Science
• Bojan Nikolic -- Simple smoothing of astronomical images in FITS format

... The R , I photometric observations of SBS 0335-052W were obtained occasionally during the study of SBS 0335-052 with the 3.5m telescope in Calar Alto on 1991 October 6. ... Aperture photometry was performed on the standard star observations using MAGNITUDE/CIRCLE task with the same aperture for all stars. ... For photometry of extended objects, we used the package SURFPHOT as well as dedicated software for adaptive filtering developed at the Astrophysical Institute of Potsdam (Lorenz et al. ...

Еще в разделе: (Показать все результаты (>2211) - www.sao.ru/ )

• Old "Structure" publications
• The Wiener-like filtering in the wavelet space
• A 20 cm VLA survey of Abell clusters of galaxies

SAI 175 anniversary . ... Moscow University . Search for in SAI Moscow University Search for in Russian astronomical resources . ... SAI Astronomical Databases . ... Browse SAI Software archive(ftp.sai.msu.su) . ASTRONET.RU - Russian Astronomical Network (available in translit also) . ... SAI Supernovae Research Group . ... Department of the Galaxy and Variable Stars (in Russian) . Sternberg Astronomical Institute Seminars . ... All-Russian Astronomical Olympiad (in Russian) . ...

Еще в разделе: (Показать все результаты (>4257) - www.sai.msu.su/ )

• Structure of the Virgo Cluster.
• Types of Nebulae
• APOD: 2011 June 29 - Abell 2744: Pandora's Cluster of Galaxies

... Structure of Data . ... Catalog . ... In SAI OCL Catalog, we introduce our work on investigation of the Milky Way system of open star clusters. The main goal of our study is a search for new clusters using huge surveys. 168 new clusters have been already discovered by us using J,H,Ks data from 2MASS point source catalog. ... For 141 new clusters, we found their physical parameters using J,H,Ks data from 2MASS catalog and, for a number of clusters, our UBVRI CCD observational magnitudes. ...

Еще в разделе: (Показать все результаты (>222) - ocl.sai.msu.ru/ )

• SAI OCL Catalog Structure
• SAI OCL Catalog Virtual Observatory
• SAI OCL Catalog Publications

... Subject and Problems of Stellar Astronomy. ... Plane of Galaxy, Methods of Its Location Determination. ... Stars Distances. ... Other Methods of Stars Distances Determination. ... Tangential Velocities, Their Determination by Self-Motions. ... Determination of Solar Apex and Spatial Velocity by Radial and Spatial Velocities of Stars. ... Features of Orientation and Parameters of Peculiar Stellar Velocities Ellipsoid. ... General and Selective Light Absorption in Galaxy. ... Darc Clouds in Galaxy. ...

Еще в разделе: (Показать все результаты (>104) - space.univ.kiev.ua/ )

• Extragalactic Astronomy

. F IGURE . 2. The distribution of globular clusters projected onto the XY [(a) and (c)] and YZ [(b) and (d)] planes for metal-rich clusters of the thick disk with [Fe/H] -1.0 [(a) and (b)] and metal-poor clusters of the halo [(c) and (d)]. The closed curves are upper envelopes drawn by eye. Clusters lying far from the central concentrations in the diagrams are outlined and their numbers indicated. discussion in the text | previous figure | next figure .

Еще в разделе: (Показать все результаты (>131) - ip.rsu.ru/ )

• Population of Galactic globular clusters, tabl
• Vladimir Marsakov Abstracts
• Subsystems of the Galactic halo, figures

. Pulkovo Observatory of Russian Academy of Sciences is situated . near Saint-Petersburg. It was founded in 1839. 196140, Saint-Petersburg, Pulkovskoye chaussee 65/1 . English version . Russian version . This page has been accessed times since May 1, 1999.

Еще в разделе: (Показать все результаты (>351) - www.gao.spb.ru/ )

• Pulkovo NEO Page: Ephemeris Support

... Australia Telescope Compact Array . ... Compact Stellar Systems in the Fornax Cluster: Super-massive Star Clusters or Extremely Compact Dwarf Galaxies? ... We suggest that these objects are either super-massive star clusters (intra-cluster globular clusters or tidally stripped nuclei of dwarf galaxies) or a new type of low-luminosity compact elliptical dwarf (``M32-type'') galaxy. ... Keywords: galaxies: star clusters -- galaxies: dwarf -- galaxies: formation . ... Properties of the compact objects ...

Еще в разделе: (Показать все результаты (>17335) - www.atnf.csiro.au/ )

• Cluster Membership
• Jing Wang
• New Structure In The Shapley Supercluster

The radial distribution of metallicity of star-forming galaxies in a galaxy cluster can inform us about the mass assembly and enrichment history of the galaxy cluster. ... Both galaxy clusters are cool-core clusters at redshift z т?? ... The gas-phase metallicity of star- forming galaxies in MACS1115+01 exhibit anti-correlation with projected distance т??0.15 ТБ 0.08 dex/Mpc, whereas the radial metallicity distribution of RXJ1532+30 is statistically flat (т??0.09 ТБ 0.12 dex/Mpc). ...

Еще в разделе: (Показать все результаты (>682) - www.mso.anu.edu.au/ )

• IAU Commission #37 (Star Clusters and Associations)
• GSAOI Super Star Clusters Science Page

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to E-ELT Armazones . ... ESO Acronyms . ... Survey Telescopes . ... Images . ... Galaxies . ... Star Clusters . ... Usage of ESO Images and Videos . ... Usage of ESO Videos and Images . ... Stars@ESO . ... ESO Science Newsletter . ... Catch a Star 2013 . ... Maps of the distribution of galaxies in the VVDS-Wide survey, showing the presence of large-scale structures. ...

Еще в разделе: (Показать все результаты (>54827) - www.eso.org/ )

• ESO - cosmology2002
• Distribution of Galaxies | ESO United States
• Distribution of Galaxies | ESO Australia

... A color image of the Andromeda galaxy always takes a little of my breath away: its golden yellow center, its bluish gossamer arms, its small, burr-like, fuzzy elliptical companion, M32. ... The beautiful images of Andromeda are a start; they give us a sense of what good form is for galaxies like our own. ... Meanwhile, radio astronomers have peered to the very center of the Galaxy and the hungry black hole there; the long radio wavelengths cut right through the dense underbrush of the Galactic...

Еще в разделе: (Показать все результаты (>1642) - www.astrosociety.org/ )

• Astronomical Society
• ASP: Globular Clusters and Satellite Galaxies: Companions to the Milky Way
• ASP: Past Pricilla and Bart Bok Award Winners

... Staff . ... Galaxies, AGN, Cosmology . ... A new survey of X-ray clusters of galaxies with the Swift-X-ray Telescope . ... In this framework, an international collaboration between INAF-OAA, INAF-Brera, INAF-OATs, the University for Science and Technology of China-Hefei, the University of Ferrara, and the University of Massachusetts-Amherst, is undertaking a new cluster survey using an X-ray facility that was never exploited before for this goal: the X-ray Telescope (XRT) onboard the Swift satellite...

Еще в разделе: (Показать все результаты (>7697) - www.arcetri.astro.it/ )

• HAEBE Clusters Analysis (Abstract)
• Cannibal Stars Cause Giant Explosions in Fornax Cluster Galaxy (ESO Press
• The puzzling core of the Phoenix cluster: deep X-ray observations

In the current version .. ... Apogee Alta . Many SBIG cameras and filter wheels . ... FITS file format with exposure, camera, telescope, object and filter header information . Interactive image display and analysis with latest SAOimage ds9 . Interactive data processing in real time with AstroImageJ . ... XmCCD creates FITS image files with comprehensive header information and displays the images using ds9. ... Latest version 5.1 for Apogee and SBIG cameras updated June 17, 2015 . ...

Еще в разделе: (Показать все результаты (>686) - www.astro.louisville.edu/ )

• University of Louisville Wide Field and Planetary Telescopes