July 2, 2016

Wide Field Image of Cygnus X-1

Cygnus X-1

Cygnus X-1 is a black hole about 15 times the mass of the Sun in orbit with a massive blue companion star. Using optical observations of the companion star and its motion around its unseen companion, the team made the most precise determination ever for the mass of Cygnus X-1, of 14.8 times the mass of the Sun. It was likely to have been almost this massive at birth, because of lack of time for it to grow appreciably.

Image Credit: DSS
Explanation from: http://chandra.si.edu/photo/2011/cygx1/more.html

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