Lectures . ... Home Lectures Lecture Series 2010-2011 Lecture Series 2010-2011 ? Exploring the Extreme Universe with the Fermi Gamma-ray Space Telescope? by David Thompson . ... Lecture Series 2010-2011 . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Amateur Astronomers Medal . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

arxiv:0902.3247 Регистрация HR 8799b в 1998 г. с помощью HST/NICMOS (HST/NICMOS detection of HR 8799 b in 1998) . ... arxiv:0902.2794 SN 2008ha: сверхновая с экстремально низкой светимостью и энергетикой (SN 2008ha: an extremely low luminosity and extremely low energy supernova) . ... Authors: A.A. Abdo et al. arxiv:0902.0996 Определение расстояния до двойного пульсара J0737-3039A/B по данным VLBI (Implications of a VLBI Distance to the Double Pulsar J0737-3039A/B) . ... Authors: Rachel Howe ...

We present a characterization of the close environment of GRB 980425 based on 5-160 ЮМm spectro-imaging obtained with Spitzer. The gamma-ray burst GRB 980425 occurred in a nearby (z = 0.0085) SBc-type dwarf galaxy at a projected distance of 900 pc from an H II region with strong signatures of Wolf-Rayet (WR) stars. ... This atypical property is rarely observed among morphologically relaxed dwarfs, suggesting a strong causal link with the gamma-ray burst (GRB) event. ... ADS Citation Query . ...

... Gamma Ray Earth . ... The pixelated planet above is actually our own planet Earth seen in gamma rays - the most energetic form of light. ... In visual appearance, M74 is a nearly perfect face-on spiral galaxy, about 30 million light-years away toward the constellation Pisces. ... A Tether in Space . ... The strange answer leads astronomers to conclude that the nucleus of the surrounding galaxy is not even visible in this image. ... Composite Crab . ... Huygens Discovers Luna Saturni . ...

Next: Gamma-Ray Bursts Up: Detection rate of binary Previous: Detection rate of binary . Figure: A schematic dependence of the detection rate ratio on the detector sensitivity (the upper scale) and the limiting distance from which binary NS (1.4+1.4M , the middle scale) and binary BH (8.5+8.5M , the bottom scale) mergings can be detected. ... At the end of this segment evolutionary effects can affect the detection ratio (the dashed line). ...

The merging galaxy Arp 220 is the prototypical luminous infrared galaxy. ... In 1996, one of the then largest VLBI experiments was conducted on Arp 220, using the compact OH maser peak as a convenient phase reference. This permitted continuum imaging of the galaxy with high sensitivity, revealing the existence of roughly a dozen unresolved sub-mJy point sources scattered across the nuclear region of the galaxy. ... The nuclear region of Arp 220 imaged with continuum VLBI at 18 cm. ...

... Science Users Information Future Facilities and Development E-ELT jump to navigation jump to content . ... Observing with ESO Telescopes . ... In December 2012 ESO Council fully approved the E-ELT Programme ( more , more , even more , still more ). ... In December 2014 ESO Council approved the construction of the E-ELT in two phases, and authorised spending on Phase 1 . ... 15 Jan 2012] Announcement of the E-ELT Workshop "Shaping E-ELT Science and Instrumentation" , 25 February 01 March 2013 . ...

... Tonight's Sky . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Fermi Telescope sees most extreme gamma-ray blast yet . ... NASA's Fermi Gamma-ray Space Telescope saw the first gamma-ray burst in high-resolution ? ... Gamma-ray bursts are the universe's most luminous explosions. ... Fermi's other instrument, the Gamma-ray Burst Monitor, simultaneously recorded the event. ... Only registered members of Astronomy.com are allowed to comment on this...

Fast interstellar scintillation of quasars, and PKS 1257-326 revisited Hayley Bignall ICRAR - Curtin University 3 well-studied "extreme" scintillating quasars 8.6 GHz 4.9 GHz: weak scattering 4.8 GHz 2.3 GHz 1.4 GHz PKS 0405-385 ­ ATCA (Kedziora-Chudczer et al. 1997, ApJL, 490, L9) 1.4 GHz: strong scattering (refractive scintillation) J1819+3845 - WSRT (Dennett-Thorpe & de Bruyn, 2000, ApJL, 529, L65) PKS 1257-326 - ATCA (Bignall et al. ... Also need to consider source size effects (>F; ~1/?) ...

... A long time ago, in a galaxy far, far away, the core of a massive star implodes under the crushing force of gravity. ... As the beams punch out of the dying star, protons collide at incredible speeds, generating shock waves that send a burst of gamma rays screaming through the universe. ... The photons from this gamma-ray burst have raced across immense tracts of mostly empty space. ... Just one of these gamma-ray photons carries a billion times more energy than the light we see with our eyes. ...

... RATAN-600 data for the BL Lacertae objects (multi-frequency catalogue, Version 1.0) . GPS radio sources . ... Kovalev et al. (2009) also investigated the correlation between radio emission and gamma-ray flux (using Fermi-LAT data after the first 3 months of observations) for 135 AGNs. ... Moreover, the correlation between high-frequency radio emission (at 37 GHz) and gamma-ray emission (100 MeV.100 GeV, Fermi-LAT data) for 249 northern AGNs was studied by Nieppola et al. ... GHz) . ...

... It turns out to be the most remote gamma-ray burst ever observed . ... PR Photo 28a/00 : Sky field near GRB 000131 . ... PR Photo 28c/00 : VLT spectrum of GRB 000131 . ... The research described in this press release is the subject of a scientific article by the team, entitled "VLT Identification of the optical afterglow of the gamma-ray burst GRB 000131 at z = 4.50" ; it will appear in a special VLT-issue (Letters to the Editor) of the European journal Astronomy & Astrophysics (December 1, 2000). ...

We performed a study of 104 RS CVn systems in the extreme ultraviolet (EUV) using the all--sky survey data obtained by the Extreme Ultraviolet Explorer (EUVE). The present sample includes several new RS CVn detections; 11 more than in the published EUVE catalogs, and 8 more than in the ROSAT Wide Field Camera catalog. ... For the RS CVn systems the losses in the EUV represent a smaller fraction of the coronal radiative losses, as compared to active late--type dwarfs. ...

The most massive black holes in the nearby Universe seem to largely be hosted by massive central cluster galaxies. The ultra-massive black hole in NGC 1277, reported by van den Bosch et al. based on a stellar kinematic measurement, is an extreme outlier in this respect. NGC 1277 is not a central cluster galaxy, but a lenticular galaxy in the Perseus Cluster, at a distance of about 3.8 from the central cluster galaxy. ...

The orbital period of a satellite increases as its mean distance from Earth grows. The space shuttle in a low altitude circular orbit, just above the atmosphere, completes one circuit in about 90 minutes. ... If you have a suitable calculator, you can easily chek the value of T for R=6.6] A satellite orbiting above the equator at that distance keeps its position above the same spot on the ground; hence this is known as the synchronous orbit, from the Greek syn--same, chronos--time. ...

... katya@sao.ru . ts@sao.ru . ... Baksan Neutrino Observatory of INR RAS . Baksan Neutrino Observatory (BNO) is a structural unit of the Institute for Nuclear Research of Russian Academy of Sciences. ... BNO staff members live in the settlement Neutrino 22 km away from Tyrnyauz. ... are at the altitude 2100 m above sea level 17 km away from the settlement Nizhnij Arkhyz. ... SAO staff members live in the settlement Nizhnij Arkhyz at a distance of 25 km to the southward of stanitsa Zelenchukskaya. ...

... July 13, 1998 . GRB 980703: A Reassuring Redshift . ... Last May, a first telling distance measure was made - GRB 970508 showed an absorption line with a redshift of about 0.8 - indicating that this gamma-ray burst (GRB) was an enormous distance away. ... Since then, though, other tantalizing coincidences have occurred: GRB 971214 occurred unusually near a galaxy with the enormous redshift of 3.4, and GRB 980425 occurred unusually near a peculiar low-redshift supernova . ... About APOD > . ...

... 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? ...

... Posts tagged ?Mahalanobis distance? ... It bears the name of its inventor, Prasanta Chandra Mahalanobis. ... Therefore, under different names, I believe that the Mahalanobis distance is frequently applied in exploring and analyzing astronomical data. ... MADS] Mahalanobis distance? Tags: LDA , MADS , Mahalanobis , Mahalanobis distance , multivariate , outliers , PCA . ... 6 Comments . ... Entries RSS . ... vlk on [MADS] Parallel Coordinates . ... Entries (RSS) and Comments (RSS) . ...

Apollo 15 . ... 1971) --- Astronaut James B. Irwin, lunar module pilot, walks away from the Lunar Roving Vehicle (LRV) during the third Apollo 15 lunar surface extravehicular activity (EVA) at the Hadley-Apennine landing site. The LRV is parked a short distance from the rim of Hadley Rille. ... While astronauts Scott and Irwin descended in the Lunar Module (LM) to explore the moon, astronaut Alfred M. Worden, command module pilot, remained with the Command and Service Module (CSM) in lunar orbit. ...