. (2011) The galactic bulge survey : outline and X-ray observations. The Astrophysical Journal Supplement Series, Vol.194 (No.2). p. 18. ISSN 0067-0049

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Abstract

We introduce the Galactic Bulge Survey (GBS) and we provide the Chandra source list for the region that has been observed to date. Among the goals of the GBS are constraining the neutron star (NS) equation of state and the black hole (BH) mass distribution via the identification of eclipsing NS and BH low-mass X-ray binaries (LMXBs). The latter goal will, in addition, be obtained by significantly enlarging the number of BH systems for which a BH mass can be derived. Further goals include constraining X-ray binary formation scenarios, in particular the common envelope phase and the occurrence of kicks, via source-type number counts and an investigation of the spatial distribution of X-ray binaries, respectively. The GBS targets two strips of 6 degrees x 1 degrees (12 deg(2) in total), one above (1 degrees < b < 2 degrees) and one below (-2 degrees < b < -1 degrees) the Galactic plane in the direction of the Galactic center at both X-ray and optical wavelengths. By avoiding the Galactic plane (-1 degrees < b < 1 degrees) we limit the influence of extinction on the X-ray and optical emission but still sample relatively large number densities of sources. The survey is designed such that a large fraction of the X-ray sources can be identified from their optical spectra. The X-ray survey, by design, covers a large area on the sky while the depth is shallow using 2 ks per Chandra pointing. In this way we maximize the predicted number ratio of (quiescent) LMXBs to cataclysmic variables. The survey is approximately homogeneous in depth to a 0.5-10 keV flux of 7.7 x 10(-14) erg cm(-2) s(-1). So far, we have covered about two-thirds (8.3 deg(2)) of the projected survey area with Chandra providing over 1200 unique X-ray sources. We discuss the characteristics and the variability of the brightest of these sources.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray astronomy
Journal or Publication Title:	The Astrophysical Journal Supplement Series
Publisher:	Institute of Physics Publishing, Inc.
ISSN:	0067-0049
Date:	June 2011
Volume:	Vol.194
Number:	No.2
Page Range:	p. 18
Identification Number:	10.1088/0067-0049/194/2/18
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), National Science Foundation (U.S.) (NSF), United States. National Aeronautics and Space Administration (NASA), Louisiana Board of Regents, Natural Sciences and Engineering Research Council of Canada (NSERC), Science and Technology Facilities Council (Great Britain) (STFC)
Grant number:	AST-0908789 (NSF), NNX07AT62A/LEQSF(2007-10) Phase3-02 (NASA/Louisiana)
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URI:	http://wrap.warwick.ac.uk/id/eprint/39997

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