News tagged with active galaxies

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
4.7 / 5 (13) 108 | with audio podcast

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
5 / 5 (7) 19 | with audio podcast

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
4.6 / 5 (10) 0 | with audio podcast

Are ultra-luminous galaxies colliding?

(Phys.org) —ltra-luminous infrared galaxies ((ULIRGs) are galaxies whose luminosity exceeds that of a trillion suns, By way of comparison, our Milky Way galaxy has a typical modest luminosity of only about ...

Jun 27, 2014
4.7 / 5 (9) 3