J/ApJ/700/1702   ChaMPlane deep galactic bulge survey. I.  (van den Berg+, 2009)
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Beginning of ReadMe : J/ApJ/700/1702 ChaMPlane deep galactic bulge survey. I. (van den Berg+, 2009) ================================================================================ ChaMPlane deep galactic bulge survey. I. Faint accretion-driven binaries in the limiting window. van den Berg M., Hong J., Grindlay J.E. <Astrophys. J., 700, 1702-1715 (2009)> =2009ApJ...700.1702V ================================================================================ ADC_Keywords: Binaries, cataclysmic ; X-ray sources ; Surveys ; Photometry, HST Keywords: Galaxy: bulge - novae, cataclysmic variables - surveys - X-rays: binaries Abstract: We have carried out a deep X-ray and optical survey with Chandra and HST of low-extinction regions in the Galactic bulge. Here we present the results of a search for low-luminosity (L_X_< 10^34^erg/s) accreting binaries among the Chandra sources in the region closest to the Galactic center, at an angular offset of 1.4deg, that we have named the Limiting Window (LW). Based on their blue optical colors, excess Halpha fluxes, and high X-ray-to-optical flux ratios, we identify three likely accreting binaries; these are probably white dwarfs accreting from low-mass companions (cataclysmic variables; CVs) although we cannot exclude that they are quiescent neutron-star or black-hole low-mass X-ray binaries. Distance estimates put these systems farther than > 2kpc. Based on their Halpha-excess fluxes and/or high X-ray-to-optical flux ratios, we find 22 candidate accreting binaries; however, the properties of some can also be explained if they are dMe stars or active galaxies. Description: As part of the Chandra Multi-wavelength Plane survey (ChaMPlane; Grindlay et al. 2005ApJ...635..920G), we have carried out an X-ray and optical survey of deep, near-simultaneous Chandra and HST pointings of three low-extinction regions, or windows, in the Galactic bulge. The Limiting Window (LW) was observed with the Chandra/ACIS-I aimpoint placed at Galactic coordinates (l,b)= (0.10deg,-1.43deg). Due to observatory constraints, the observation was split in three exposures: ObsID 6362 (2005 August 19, 38ks), ObsID 5934 (2005 August 22, 41ks), and ObsID 6365 (2005 October 25, 21ks). We observed with HST the inner area of the ACIS field on the Advanced Camera for Surveys (ACS). The observations (program GO-10353) were carried out simultaneous with the first Chandra exposure (2005 Aug 19).

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