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The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (III): luminosity functions of LMXBs and dependence on stellar environments by Lin, Dacheng; Irwin, Jimmy A.; Wong, Ka-wah; Jennings, Zachary G.; Homan, Jeroen; Romanowsky, Aaron J.; Strader, Jay; Brodie, Jean P.; Sivakoff, Gregory R.; Remillard, Ronald A. is a scholarly article available to read on EtoBox.

What is The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (III): luminosity functions of LMXBs and dependence on stellar environments about?

We have studied the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-Ray Visionary Project Observation. With a total exposure time of ~1.1 Ms, we constructed the XLF down to a limiting luminosity of ~10^36 erg/s, much deeper than typically reached for other early-type galaxies. We found significant flattening of the overall LMXB XLF from dN/dL \propto L^{-2.2\pm0.4} above 5.5x10^37 erg/s to dN/dL \propto L^{-1.0\pm0.1} below it, though we could not rule out a fit with a higher break at ~1.6x10^38 erg/s. We also found evidence that the XLF of LMXBs in globular clusters (GCs) is overall flatter than that of field LMXBs. Thus our results for this galaxy do not support the idea that all LMXBs are formed in GCs. The XLF of field LMXBs seems to show spatial variation, with the XLF in the inner region of the galaxy being flatter than that in the outer region, probably due to contamination of LMXBs from undetected and/or disrupted GCs in the inner region. The XLF in the outer region is probably the XLF of primordial field LMXBs, exhibiting dN/dL \propto L^{-1.2\pm0.1} up to a break close to the Eddin

Author

Lin, Dacheng; Irwin, Jimmy A.; Wong, Ka-wah; Jennings, Zachary G.; Homan, Jeroen; Romanowsky, Aaron J.; Strader, Jay; Brodie, Jean P.; Sivakoff, Gregory R.; Remillard, Ronald A.

Published

2015

Language

EN