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SlideshowReport

X Rays Generated by Accretion of Matter Near a Black Hole

Description
X Rays Generated by Accretion of Matter Near a Black Hole
Stellar-remnant black holes, such as Cygnus X-1, LMC X-3, V404 Cygni, and probably A0620-00, are detected in close binary star systems. This
drawing of the Cygnus X-1 system shows how gas from the 30-solar-mass companion star, HDE 226868, transfers to the black hole, which
has at least 11 solar masses. This process creates an accretion disk. As the gas spirals inward, friction and compression heat it so much
that the gas emits X rays, which astronomers can detect
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