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Date and Time of the Query: 2019-06-25 T03:15:52 PDT
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For refcode 2011A&A...533A..33Z:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2011A&A...533A..33Z Luminosity functions of LMXBs in different stellar environments Zhang, Z.; Gilfanov, M.; Voss, R.; Sivakoff, G. R.; Kraft, R. P.; Brassington, N. J.; Kundu, A.; Jordan, A.; Sarazin, C. Abstract. Aims: Based on the archival data from the Chandra observations of nearby galaxies, we study different sub populations of low-mass X-ray binaries (LMXBs) - dynamically formed systems in globular clusters (GCs) and in the nucleus of M 31 and (presumably primordial) X-ray binaries in the fields of galaxies. Our aim is to produce accurate luminosity distributions of X-ray binaries in different environments, suitable for quantitative comparison with each other and with the output of population synthesis calculations. Methods: Our sample includes seven nearby galaxies (M 31, Maffei 1, Centaurus A, M 81, NGC 3379, NGC 4697, and NGC 4278) and the Milky Way, which together provide relatively uniform coverage down to the luminosity limit of 10^35^ erg s^-1^. In total we have detected 185 LMXBs associated with GCs, 35 X-ray sources in the nucleus of M 31, and 998 field sources of which ~365 are expected to be background AGN. We combine these data, taking special care to accurately account for X-ray and optical incompleteness corrections and the removal of the contamination from the cosmic X-ray background sources, to produce luminosity distributions of X-ray binaries in different environments to far greater accuracy than has been obtained previously. Results: We found that luminosity distributions of GC and field LMXBs differ throughout the entire luminosity range, the fraction of faint (log (L_X_) < 37) sources among the former being ~4 times less than in the field population. The X-ray luminosity function (XLF) of sources in the nucleus of M 31 is similar to that of GC sources at the faint end but differs at the bright end, with the M 31 nucleus hosting significantly fewer bright sources. We discuss the possible origin and potential implications of these results. Tables 2 and 6 are available in electronic form at http://www.aanda.org Key words: X-rays: binaries, globular clusters: general
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