Populations of Transient Galactic Bulge X-Ray Sources

Details Populations of Transient Galactic Bulge X-Ray Sources Populations of Transient Galactic Bulge X-Ray Sources

2001-09-16

arxiv.org/abs/astro-ph/0109240v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to be published in proceedings of the conference, New Century of X-Ray Astronomy, held in Yokohama, Japan,

Scientific paper

Starting in 1999, the Rossi X-ray Timing Explorer (RXTE) has monitored the central bulge region of the Galaxy with the Proportional Counter Array (PCA), resolving about 50 binary X-ray sources, including 18 sources discovered by RXTE and BeppoSAX. The accretion rates that RXTE observed from these sources ranged from highs approaching Eddington limits to lows that may correspond to mass exchange for a binary period near the minimum of 80 minutes. Several neutron star binaries with low peak luminosity have outburst or cycle time-scales which are shorter than those of brighter and better known counterparts. We compare the characteristics of the binaries with low rates of mass exchange to predictions of their evolution.

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