Is there any evidence for a massive black hole in Cyg X-3

Details Is there any evidence for a massive black hole in Cyg X-3 Is there any evidence for a massive black hole in Cyg X-3

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..818m&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 818-821 (1997).

Computer Science

Neutron Stars, X-Ray Sources, X-Ray Bursts, Black Holes, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae

Scientific paper

There has been a recent suggestion that Cyg X-3 contains a black hole (BH) of mass M1~17Msolar. This interpretation is closely linked to a previous claim that Cyg X-3 contains a Wolf-Rayet star of mass M2~10Msolar. The latter interpretation would imply that the X-ray source in this close binary (P=4.8 hr) is enshrouded by a relatively cool superstrong wind with Ṁ>=10-5 Msolar yr-1. It can be shown that such a wind would be completely opaque to the low energy X-rays observed from the source and hence the Wolf-Rayet hypothesis can not be a correct one. By pursuing the same argument it also follows that the compact object must be of modest mass ruling out the existence of a massive BH in Cyg X-3. And a more probable scenario for Cyg X-3 would be one where the compact object is a canonical neutron star (NS) and the companion is an extremely low mass dwarf, M2~10-2 Msolar much like PSR1957+20.

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