News tagged with accretion disk

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Star's 'cry' heralds new era for testing relativity

(Phys.org) -- Last year, astronomers discovered a quiescent black hole in a distant galaxy that erupted after shredding and consuming a passing star. Now researchers have identified a distinctive X-ray signal ...

Aug 02, 2012
4.6 / 5 (21) 0 | with audio podcast

Why is Earth so dry?

(Phys.org) -- With large swaths of oceans, rivers that snake for hundreds of miles, and behemoth glaciers near the north and south poles, Earth doesn't seem to have a water shortage. And yet, less than one ...

Jul 17, 2012
4.3 / 5 (16) 13 | with audio podcast

Ghostly gamma-ray beams blast from Milky Way's center

(Phys.org) -- As galaxies go, our Milky Way is pretty quiet. Active galaxies have cores that glow brightly, powered by supermassive black holes swallowing material, and often spit twin jets in opposite directions. ...

May 29, 2012
4.2 / 5 (11) 16 | with audio podcast

Cygnus X-1: Blue supergiant pairs with black hole

Discovered in 1964 during a rocket flight, Cygnus X-1 holds the record for being the strongest X-ray source seen from Earth. The blue supergiant star designated as HDE 226868 is just part of this high-mass ...

Jun 23, 2011
4.8 / 5 (5) 2

Black holes spinning faster than ever before

(PhysOrg.com) -- Two UK astronomers have found that the giant black holes in the centre of galaxies are on average spinning faster than at any time in the history of the Universe. Dr Alejo Martinez-Sansigre ...

May 23, 2011
4.3 / 5 (16) 15 | with audio podcast

Black hole spin may create jets that control galaxy

(PhysOrg.com) -- Scattered throughout every galaxy are black holes, regions that gobble up matter and energy. Although we can't see black holes, scientists can infer their size, location and other properties ...

Feb 11, 2010
4.6 / 5 (21) 16 | with audio podcast

Erratic black holes regulate their growth (w/Videos)

(PhysOrg.com) -- New results from NASA's Chandra X-ray Observatory have made a major advance in explaining how a special class of black holes may shut off the high-speed jets they produce. These results suggest ...

Mar 25, 2009
4.7 / 5 (11) 5
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