/ftp/cats/J_ApJ/697/./224



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J/ApJ/697/224        A Chandra study of omega Centauri          (Haggard+, 2009)
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Beginning of ReadMe : J/ApJ/697/224 Chandra X-ray sources in omega Cen (Haggard+, 2009) ================================================================================ A Chandra study of the Galactic globular cluster omega Centauri. Haggard D., Cool A.M., Davies M.B. <Astrophys. J., 697, 224-236 (2009)> =2009ApJ...697..224H ================================================================================ ADC_Keywords: Clusters, globular ; X-ray sources ; Cross identifications Keywords: binaries: close - globular clusters: individual (omega Centauri) - novae, cataclysmic variables - stars: neutron - X-rays: binaries Abstract: We analyze a  70ks Chandra Advanced CCD Imaging Spectrometer exposure of the globular cluster omega Cen (NGC 5139). The  17'x17' field of view fully encompasses three core radii and almost twice the half-mass radius. We detect 180 sources to a limiting flux of  4.3x10^-16^erg/cm^2^/s (L_x_=1.2x10^30^erg/s at 4.9kpc). After accounting for the number of active galactic nuclei and possible foreground stars, we estimate that 45-70 of the sources are cluster members. Four of the X-ray sources have previously been identified as compact accreting binaries in the cluster - three cataclysmic variables (CVs) and one quiescent neutron star. Correlating the Chandra positions with known variable stars yields eight matches, of which five are probable cluster members that are likely to be binary stars with active coronae. Extrapolating these optical identifications to the remaining unidentified X-ray source population, we estimate that 20-35 of the sources are CVs and a similar number are active binaries. This likely represents most of the CVs in the cluster, but only a small fraction of all the active binaries. Description: We obtained two exposures of omega Cen using the imaging array of the Advanced CCD Imaging Spectrometer (ACIS-I) on 2000 January 24-25, in "very faint" mode. The total exposure time was 72.4ks.