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Active Galactic Nuclei (7)

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	Black Holes - http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html Black hole page from NASA's "Imagine the universe!" site; includes a section on observational aspects - "If We Can't See Them, How Do We Know They're There?"
	Field Guide to X-ray Sources - http://chandra.harvard.edu/xray_sources/blackholes.html Pages on the website of the Chandra X-Ray Observatory; includes information about stellar, mid-mass and supermassive black holes, Chandra images, and a podcast.
	Radio Astronomers Lift 'Fog' on Milky Way's Dark Heart - http://www.nrao.edu/pr/2004/sagastar/ Press release by the National Radio Astronomy Observatory about observations of the immediate neighborhood of our galaxy's central supermassive black hole.
	Black Holes in Astrophysics - http://arxiv.org/abs/gr-qc/0506078 Review article by Ramesh Narayan (Harvard-Smithsonian Center for Astrophysics) about the astrophysical evidence for black holes.
	Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way - http://arxiv.org/abs/astro-ph/0210426 Article by R. Schodel and colleagues (Max Planck Institute for Extraterrestrial Physics) about the best evidence to date for the existence of a supermassive black hole in the center of our own galaxy - the way it influences the orbits of nearby stars.

	Hubble Space Telescope Discovers Disk Fueling Possible Black Hole - http://hubblesite.org/newscenter/archive/releases/1992/27/text/ News item published on the website of the Space Telescope Science Institute.
	Do Black Holes Exist? - http://pgostrov.googlepages.com/e3.html Brief text by Pablo G. Ostrov about the evidence for the existence of black holes, aimed at a general audience.
	The Afterglow of Massive Black Hole Coalescence - http://arxiv.org/abs/astro-ph/0410343 Article by Milos Milosavljevic and Stearl Phinney; describes the kind of afterglow that should be visible for X-ray telescopes when two massive black holes merge.
	Evidence for the Black Hole Event Horizon - http://arxiv.org/abs/astro-ph/0310692 Review article by Ramesh Narayan about possible observational evidence for the defining feature of black holes.
	Detection of Hard X-ray Emission from the Galactic Nuclear Region with INTEGRAL - http://arxiv.org/abs/astro-ph/0311147 Article by Guillaume Belanger and colleagues; recounts X-ray observations of the neighborhood of our galaxy's central black hole.

	Astrophysical Evidence for the Existence of Black Holes - http://arxiv.org/abs/astro-ph/9912186 Review article by Annalisa Celotti, John C. Miller, and Dennis W. Sciama (SISSA, Trieste) about the current state of the search for observational evidence for the existence of both stellar-mass and supermassive black holes.
	Study of Accretion Processes on Black Holes: Fifty Years of Developments - http://arxiv.org/abs/astro-ph/0402562 Review article by Sandip K. Chakrabarti of the research done on one of the main mechanisms by which black holes cause highly luminous phenomena in their immediate neighborhood.
	XMM: Black Holes and Quasars - http://www.sr.bham.ac.uk/xmm/blackholes.html Educational pages on the website of the space-borne X-ray telescope XMM, hosted by the University of Birmingham. Information about black holes and other astronomical sources of X-rays.

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