The Chandra Galactic Bulge Survey

Details The Chandra Galactic Bulge Survey The Chandra Galactic Bulge Survey

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714424h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #144.24; Bulletin of the American Astronomical Society, Vol. 43, 2011

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The Chandra Galactic Bulge Survey (CGBS) is a shallow but wide survey of two approximately 6x1 degree strips of the Galactic Bulge about a degree above and below the plane. The survey by design targets regions where extinction and crowding are manageable and optical counterparts are accessible to detailed follow-up. Our strategy is based on going deep enough to detect quiescent low-mass X-ray binaries (LMXBs), but no deeper in order to avoid an excess of cataclysmic variables (CVs), while covering a large area to maximize the numbers of recovered objects. The primary goals of the CGBS are to test predictions of binary evolutionary models through number counts and period distributions of detected sources, and to greatly expand the sample of LMXBs suitable for detailed optical follow-up including mass determination. We have recovered over a thousand X-ray sources most with optical counterparts, and expect these to be divided evenly between quiescent LMXBs, magnetic CVs, and R CVn stars, with smaller numbers of other source types. We are actively pursuing multiwavelength follow-up including searches for optical, infrared, and ultraviolet counterparts, measurement of variability, and optical spectroscopy. So far we have identified about ten candidate LMXBs and CVs and a few other unusual objects such as X-ray selected sdO and carbon stars, both likely products of binary evolution.
This work is supported by the National Science Foundation under Grant No. AST-0908789.

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