News tagged with active galaxies
Three-telescope interferometry allows astrophysicists to observe how black holes are fueled
(Phys.org) -- By combining the light of three powerful infrared telescopes, an international research team has observed the active accretion phase of a supermassive black hole in the center of a galaxy tens ...
May 16, 2012 |
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A new paradigm for active galactic nuclei
(Phys.org) -- Seyfert galaxies are similar to normal galaxies like our own Milky Way except in one critical respect: their nuclei are fantastically bright, in extreme instances as luminous as 100 billion suns. ...
Apr 24, 2012 |
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Researchers say galaxy may swarm with 'nomad planets'
(PhysOrg.com) -- Our galaxy may be awash in homeless planets, wandering through space instead of orbiting a star.
Feb 23, 2012 |
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Black holes and star formation
(PhysOrg.com) -- It has long been recognized that galaxy mergers or even close interactions can play a vital role in shaping the morphology of galaxies. One way they can do so, it is thought, is by triggering ...
Feb 09, 2012 |
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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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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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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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Mergers Most Likely Fuel for Active Galaxies
(PhysOrg.com) -- The first solid evidence for how the center of some galaxies come to shine brightly while others barely flicker has been uncovered by researchers at the Kavli Institute for Particle Astrophysics ...
Jun 16, 2010 |
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Supermassive black holes may frequently roam galaxy centers
A team of astronomy researchers at Florida Institute of Technology and Rochester Institute of Technology in the United States and University of Sussex in the United Kingdom, find that the supermassive black ...
May 25, 2010 |
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How do supermassive black holes get so big?
(PhysOrg.com) -- At the center of most galaxies lie supermassive black holes that can grow to become more than a billion times larger than our Sun. However, astrophysicists don’t fully understand the formation ...
Apr 26, 2010 |
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