... November 25, 1999 . 3C 295: X-rays From A Giant Galaxy . ... Five billion light-years away, the giant elliptical galaxy 3C295 is a prodigious source of energy at radio wavelengths . ... Embedded in the cloud is a cluster of about 100 galaxies, too cool to be seen in the X-ray picture. About two million light-years across, the X-ray hot cloud itself contains enough material to create another 1,000 galaxies or so making the cluster and cloud among the most massive objects in the Universe. ...

home education > resources . SEARCH ASP SITE: Match ALL words Match ANY word . ... Astronomy Education Bibliography . ... Black Holes: An Introductory Resource List . ... On how our time differs from the early universe in terms of what galaxies are doing, and what role supermassive black holes play. ... Discusses how supermassive black holes powering the centers of galaxies may be more common than thought. ... On Hubble observations showing how common supermassive black holes are in galaxies. ...

... The Cosmic X-Ray Background . ... Now, peering through a hole in the obscuring gas and dust of our own Milky Way Galaxy, the powerful orbiting XMM-Newton telescope has recorded this deep image of the x-ray sky , resolving some of the mysterious background into many faint individual sources. ... Do massive black holes reside in the hearts of all large galaxies? ... Publications with keywords: black hole - XMM-Newton - x-ray background - cosmic microwave background radiation - X-ray . ...

... Sunday , October 6, 2013 Standard quasar-like AGN Standard AGN have: · · · · · Luminous accretion disk (with X-ray corona) Bright line emission (ionised by disk) Dusty obscuring torus (emits in IR/sub-mm) Orientation-dependent observed properties Sometimes, extended radio jets Sunday , October 6, 2013 Another class of AGN Other AGN , exemplified by weak radio ... Sunday, October 6, 2013 Summary · · · · · · Not all AGN follow the "standard" accretion disk picture. ...

. Go Here for Hubble Ultra Deep Field . ___________________________________________________________________ The Electronic Universe Project e-mail: nuts@moo.uoregon.edu

... Now we present the topographical map for the COOC criterion calculated for both galactic X-ray sources taken from Table  4 and binary pulsar species from Table  6 in coordinates the initial mass ratio exponent - mean kick velocity (Figure  26 ). ... Figure 26: The COOC criterion for X-ray galactic sources and binary radiopulsars versus the initial mass ratio exponent and mean space kick velocity for different kick velocity distributions. ...

... I am currently leading the GHOSTS Survey , a large HST survey of the resolved stelllar populations of bulges, thick disks, and halos of nearby, massive disk galaxies. ... Databases, archives, resources . ... NED for extra-galactic data, images and references . ... Canadian Astronomical Data Center with the CFHT, HST, JCMT, ESO, La Palma, USNO, UKIRT, Hipparcos and Guide Star Catalog archives . ... HST UV-optical "true color images" from our local universe HST UV galaxy survey (password protected) . ...

... A radio galaxy is a galaxy that emits an unusually big amount of energy at radio wavelengths. ... Inside of each galaxy with an active nucleus (radio galaxies are among them) there must be a system of a "central machine" responsible for the colossal amount of the emitted energy from radio to gamma ranges. ... Sometimes a radio source in an active galaxy may flare again if the needed conditions appear (a new portion of matter would fall into the furnace of the "central machine"). ...

... About ATNF overview . ... Parkes radio telescope . ... Online Resources . ... Australia Telescope 20GHz Survey . ... We present the first results from a study of the radio continuum properties of galaxies in the 2dF Galaxy Redshift Survey, based on thirty 2dF fields covering a total area of about 100deg 2 . ... mag. are detected as radio continuum sources in the NRAO VLA Sky Survey (NVSS). ... radio continuum: galaxies, galaxies: distances and redshifts, galaxies: active, galaxies: starburst . ...

CATS home ] [ Back to CATS list ] [ ftp ] . ... Received 1999 November 5; accepted 2000 February 10 Since radio sources with Ultra Steep Spectra (USS; alpha -35ddeg, we selected only sources with angular sizes Theta Comparison with spectrally unbiased samples at similar flux density levels, shows that our spectral index, flux density, and angular size selections do not affect the angular size distribution of the sample, but do avoid significant contributions by faint foreground spiral galaxies. ...

... Our Sun is part of a huge wheel-shaped collection of stars. ... Astronomers have long suspected it was a very massive black hole, and that every galaxy had such a central mass, created early in the history of the universe. ... However, unless that object happens to be headed directly at the black hole (a relatively small target) it will just swing around and fly away again, like a comet making a pass at the Sun. The velocity acquired in falling towards the black hole also helps it escape. ...

... I note that "Z" plays an important role in what the ALFA surveys will look for: . ... low Z . nearby low mass . ... Arecibo . ... ADBS (Arecibo Dual Beam Survey): Rosenberg & Schneider 2002. ... A few sources with unobvious optical counterparts. ... Coverage wins for volume, but if you do a shallow survey you are sampling only the nearby volume at low masses. ... So need artificial test sources to find completeness. ... Total volume within survey in which source could have been detected. ...

... 2000 August 18 . X-Rays From Antennae Galaxies . ... CXC , SAO , NASA . Explanation: A bevy of black holes and neutron stars shine as bright, point-like sources against bubbles of million degree gas in this false-color x-ray image from the orbiting Chandra Observatory . ... The exploding stars litter the scene with bubbles of shocked hot gas and collapsed stellar cores . ... Tomorrow's picture: X-ray Sky . ... About APOD | ... NASA Technical Rep.: ... A service of: LHEA at NASA / GSFC . ...

... The mysterious music is played by the stars ... some very special ones, called "pulsars". Visit the Jodrell Bank Centre for Astrophysics to listen to more pulsars . ... The first pulsar was discovered by a woman from Northern Ireland, Dame Jocelyn Bell-Burnell (who was in Belfast a short while ago to give a beautiful talk about astronomy and poetry ) during her PhD, in 1967. ... Monday, 11 May 2009 22:57 . International Year of Astronomy, Ireland National Node . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Our Galaxy . ... Other Galaxies . ... Space Flight . ... This week?s€а Carnival is hosted by the excellent We Are All in the Gutter (Looking at the Stars) blog .€а You can go straight to the Carnival by clicking here. ... Hello, IтАЩm Colin, welcoming you to Astronotes, the PlanetariumтАЩs official blog. Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

... Posts tagged ?source matching? ... Without an optical afterglow, a galaxy within the 2 arc second error region of a GRB x-ray afterglow is identified as a host galaxy; however confusion can rise due to the facts that 1. the edge of a galaxy is diffused, 2. multiple sources could exist within 2 arc second error region, 3.the distance between the galaxy and the x-ray afterglow is measured by projection, and 4. lensing causes increase of brightness and position shifts. ... ArXiv] GRB host galaxies, Aug...

... Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Dynamical models of multiple globular cluster populations around massive galaxies . ... Different techniques have been devised to separate multiple GC populations and perform dynamical analyses. ... Within this project, the PhD candidate will examine mock models of multiple GC populations around massive galaxies, devising `blinded' functional tests and comparing the possible sources of bias in different techniques....

... Home Gallery Astrophotography Deep Sky Images by Joe DiNapoli . ... Deep Sky Images by Joe DiNapoli . ... Deep Sky Gallery by Ed Fox . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... QSO spectra in the ROSAT band are steeper than the background at harder energies, and furthermore at fluxes below 1E-14 ergs/(s cmќ) the quasar source counts flatten off and are replaced by more numerous populations of relatively low red-shift objects, apparently Narrow Emission Line Galaxies (NELG). ... We extracted the luminosity function from ROSAT Deep Survey results, and extrapolated by a factor of 2 - 3 to account for changes expected in the harder XMM band. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... January 2006 resources . FROM THE January 2006 ISSUE . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...