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Date and Time of the Query: 2019-06-17 T14:28:17 PDT
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For refcode 2010ApJ...721.1523K:
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2010ApJ...721.1523K X-ray Properties of Young Early-type Galaxies. I. X-ray Luminosity Function of Low-mass X-ray Binaries Kim, Dong-Woo; Fabbiano, Giuseppina Abstract. We have compared the combined X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) detected in Chandra observations of young, post-merger elliptical galaxies with that of typical old elliptical galaxies. We find that the XLF of the "young" sample does not present the prominent high-luminosity break at L_X_ > 5 x 10^38^ erg s^-1^ found in the old elliptical galaxy XLF. The "young" and "old" XLFs differ with a 3{sigma} statistical significance (with a probability less than 0.2% that they derive from the same underlying parent distribution). Young elliptical galaxies host a larger fraction of luminous LMXBs (L_X_ > 5 x 10^38^ erg s^-1^) than old elliptical galaxies and the XLF of the young galaxy sample is intermediate between that of typical old elliptical galaxies and that of star-forming galaxies. This observational evidence may be related to the last major/minor mergers and the associated star formation. Key words: galaxies: elliptical and lenticular, cD, X-rays: binaries, X-rays: galaxies
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