Quasars shine a new light on cosmic distances

Astronomers using NASA's Chandra X-ray Observatory have found evidence for a population of old stellar black holes. The discovery provides new insight into the nature of stellar black holes, which is a class that can produce as much energy in X-rays as what a million suns could radiate at all wavelengths. The astronomers used Chandra to find an outburst that was produced by a black hole in the spiral galaxy M83, which is located about 15 million light years from Earth. Chandra helped the researchers discover a new ultra luminous X-ray source, or ULX.  NASA said these objects give off more X-rays than most binary systems, in which a companion star orbits the remains of a collapsed star. These collapsed stars form either a dense core known as a neutron star, or a black hole.  The space agency said the extra X-ray emission suggests ULXs contain black holes that might be more massive than the ones found other places in the galaxy. The companion stars to ULXs are young, massive stars, and the new research provides

Quasars shine a new light on cosmic distances

New method correlates redshift of different quasars

Fri 4 May 12 from Physics World

NASA's Chandra sees remarkable outburst from old black hole

An extraordinary outburst produced by a black hole in a nearby galaxy has provided direct evidence for a population of old, volatile stellar black holes. The discovery, made by astronomers using ...

Mon 30 Apr 12 from Phys.org

NASA'S Chandra Sees Remarkable Outburst from Old Black Hole, Mon 30 Apr 12 from Science @ NASA

NASA's Chandra Sees Remarkable Outburst From Old Black Hole, Wed 2 May 12 from SpaceDaily

NASA's Chandra sees remarkable outburst from old black hole, Tue 1 May 12 from Labspaces.net

NASA's Chandra sees remarkable outburst from old black hole, Mon 30 Apr 12 from e! Science News

X-ray quasars, and a distance record

Quasars are thought to be galaxies whose bright nuclei contain massive black holes around which disks are actively accreting matter. The accretion process releases vast amounts of energy, often ...

Mon 30 Apr 12 from Phys.org

Black Hole Unleashes Extraordinarily Bright X-Ray Burst

The outburst came from a black hole in the spiral galaxy M83.

Tue 1 May 12 from Livescience

Black Hole Unleashes Extraordinarily Bright X-Ray Burst, Tue 1 May 12 from SPACE.com

Chandra Reveals Outburst From Old Black Holes

Astronomers using NASA's Chandra X-ray Observatory have found evidence for a population of old stellar black holes. The discovery provides new insight into the nature of stellar black holes, ...

Mon 30 Apr 12 from RedOrbit

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