High Energy Transient Events From Cygnus X-1: Evidence for a Source of Galactic Gamma-Ray Bursts

Details High Energy Transient Events From Cygnus X-1: Evidence for a Source of Galactic Gamma-Ray Bursts High Energy Transient Events From Cygnus X-1: Evidence for a Source of Galactic Gamma-Ray Bursts

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..238m&link_type=abstract

Astronomical Journal v.114, p.238

Astronomy and Astrophysics

Astronomy

5

X-Rays: Bursts

Scientific paper

We investigate the possibility that at least some gamma-ray bursts (GRBs) listed in the Compton Gamma-ray Observatory Burst and Transient Source Experiment (BATSE) 3B catalog originate from known galactic X-ray sources. We find that there is a slight, but not statistically significant, excess of BATSE GRBs in the direction of Scorpius X-1. This is consistent with there being at most only a few triggered GRBs originating from Sco X-1. We present evidence that three of these bursts might be high energy transient events associated with accretion in Sco X-1. Due to the lack of an excess of GRBs from the galactic center and galactic plane we conclude that galactic X-ray binaries cannot account for a significant number of GRBs. However, many BATSE bursts originate from the black hole candidate Cygnus X- 1. This is supported by the fact that the surface density on the sky of bursts in the direction of Cyg X- 1 is more than a factor of 2 greater than the average for the rest of the sky. We show that the process used to remove these bursts from the BATSE catalog has resulted in an anomalous (a measure of the average burst intensity) for the region of the sky near Cyg X- 1. We interpret this result as being evidence that some of the strong bursts remaining in the BATSE 3B catalog are actually Cyg X-2 accretion events and some of the weak bursts attributed to Cyg X-1 and removed from the BATSE 3B catalog are actually "classical" gamma-ray bursts. Since these Cyg X-1 accretion related bursts are apparently indistinguishable from the other GRBs, we suggest that accretion onto cosmological black holes may be responsible for the general population of GRBs.

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