News tagged with galactic nuclei
German scientists ready for the hunt on dark energy
The German and Russian partners of the new eROSITA X-ray space observatory have now agreed on how to split the data from the first four years of an all sky survey. This decision was announced today at the ...
Oct 20, 2011 |
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Galaxy mergers not the trigger for most black hole feeding frenzies
(PhysOrg.com) -- A survey of distant galaxies using the Hubble Space Telescope has put another nail in the coffin of the theory that galaxy mergers are the main trigger for turning quiescent supermassive black ...
Oct 14, 2011 |
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Suspects in the quenching of star formation exonerated
Supermassive black holes millions to billions times the mass of our Sun lie at the heart of most, maybe all large galaxies. Some of these power brilliantly luminous, rapidly growing objects called active galactic nuclei that ...
Oct 11, 2011 |
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AGNs as a new standard candle?
Nope. A standard candle isn’t the same red, green, blue, yellow and omni-present pink wax sticks that decorate your every day birthday cake. Until now a standard candle meant a Cepheid variable star – ...
Sep 27, 2011 |
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INTEGRAL observations suggest unified model for Active Galactic Nuclei requires a rethink
Scrutinizing a large sample of Active Galactic Nuclei with INTEGRAL, astronomers have found that, unexpectedly, sources affected by stronger absorption at lower energies show an excess emission in the hard ...
Aug 03, 2011 |
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What activates a supermassive black hole?
A new study combining data from ESO's Very Large Telescope and ESA's XMM-Newton X-ray space observatory has turned up a surprise. Most of the huge black holes in the centres of galaxies in the past 11 billion ...
Jul 13, 2011 |
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Astrophysicists use X-ray fingerprints to study eating habits of giant black holes
By studying the X-rays emitted when superheated gases plunge into distant and massive black holes, astrophysicists at the Georgia Institute of Technology have provided an important test of a long-standing ...
Jun 06, 2011 |
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Radio telescopes capture best-ever snapshot of black hole jets (w/ video)
(PhysOrg.com) -- An international team, including NASA-funded researchers, using radio telescopes located throughout the Southern Hemisphere has produced the most detailed image of particle jets erupting from ...
May 21, 2011 |
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The murmur of a monster
The Andromeda galaxy is the nearest large galaxy to our Milky Way. Like the Milky Way, it has a spiral-arm structure with a massive black hole at its nucleus. Unlike the Milky Way, however, its black hole ...
Feb 28, 2011 |
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Identity parade clears cosmic collisions of the suspicion of promoting black hole growth
(PhysOrg.com) -- What happens when galaxies crash together? For years, these cosmic collisions have been blamed for triggering violent outbursts at the hearts of galaxies. Now, a remarkable piece of detective ...
Jan 05, 2011 |
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How often do giant black holes become hyperactive?
(PhysOrg.com) -- A new study from NASA's Chandra X-ray Observatory tells scientists how often the biggest black holes have been active over the last few billion years. This discovery clarifies how supermassive ...
Dec 20, 2010 |
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Rain of giant gas clouds create active galactic nuclei
Galaxies like our own were built billions of years ago from a deluge of giant clouds of gas, some of which continue to rain down. Now new calculations tie the rain of giant clouds of gas to active galactic nuclei (AGN), the ...
Jul 08, 2010 |
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HESS-II: a new camera for exploring the violent Universe
HESS, one of the world's best-performing ground-based gamma ray detectors, will soon boast a fifth telescope that will double its potential for making new discoveries. The telescope will be equipped with a ...
Jun 17, 2010 |
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On the deceleration behaviour of black holes
(PhysOrg.com) -- Researchers use the concept of "anti-kick" to explain why the speed suddenly decreases after the collision of such exotic objects.
Jun 04, 2010 |
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The turbulent past of the Milky Way's black hole
The supermassive black hole at the center of our Galaxy went through turbulent times over the past centuries. We know this thanks to its surrounding molecular clouds, whose varying X-ray and gamma-ray luminosity ...
May 28, 2010 |
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