Spring 2012 ASTR 2030 Homepage
The x-ray sky observed by the HEAO-1 satellite (1980)
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Cygnus X-1 (black hole)
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The mass of the black hole in Cygnus-X1 has been measured to be
14.8 ± 1.0 solar masses
(Orosz et al. 2011 “The Mass of the Black Hole in Cygnus X-1”).
Its spin parameter, greater than 0.97, is near maximal (Guo et al. 2011 “The Extreme Spin of the Black Hole in Cygnus X-1”). | |
X-ray
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Optical
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Artist's impression
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Hercules X-1 (neutron star)
The microquasar (x-ray binary with jets) XTE J1550-564
