SIMBAD references

2010ApJ...718..488S - Astrophys. J., 718, 488-493 (2010/July-3)

New evidence for a black hole in the compact binary Cygnus X-3.


Abstract (from CDS):

The bright and highly variable X-ray and radio source known as Cygnus X-3 was among the first X-ray sources discovered, yet it remains in many ways an enigma. It is known to consist of a massive, Wolf-Rayet primary in an extremely tight orbit with a compact object. However, one of the most basic of parameters–the mass of the compact object–is not known, nor is it even clear whether it is a neutron star or a black hole (BH). In this paper, we present our analysis of the broadband high-energy continua covering a substantial range in luminosity and spectral morphology. We apply these results to a recently identified scaling relationship that has been demonstrated to provide reliable estimates of the compact object mass in a number of accretion powered binaries. This analysis leads us to conclude that the compact object in Cygnus X-3 has a mass greater than 4.2 M, thus clearly indicative of a BH and as such, resolves a long-standing issue. The full range of uncertainty in our analysis and from using a range of recently published distance estimates constrain the compact object mass to lie between 4.2 M and 14.4 M . Our favored estimate, based on a 9.0 kpc distance estimate, is ∼10 M, with an error margin of 3.2 solar masses. This result may thus pose challenges to shared-envelope evolutionary models of compact binaries, as well as establishing Cygnus X-3 as the first confirmed accretion-powered galactic gamma-ray source.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - radiation mechanisms: non-thermal - stars: individual (Cygnus X-3, GRS 1915+105)

Simbad objects: 15

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