Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-23
Astronomy and Astrophysics
Astrophysics
Scientific paper
A recent paper (arXiv:0804.3463) claims that the presence of a soft X-ray component in an X-ray source in NGC 6946 provides strong evidence that its black hole mass is definitely $>100\msun$, and more probably $\sim 400\msun$, even if the source is beamed. I show that the data are instead very compatible with a black hole mass of only $5\msun$, radiating isotropically (i.e. no beaming) and a mass transfer rate about 60 times the Eddington value, i.e. $1.25 \times 10^{-5} \msun {\rm yr}^{-1}$. Such a system is very similar to the probable descendant of the Galactic X-ray binary Cygnus X--1 once the supergiant companion evolves to fill its Roche lobe.
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