Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-04-14
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
18 pages, 4 figures, accepted for publication in ApJ
Scientific paper
We have compared the combined X-ray luminosity function (XLF) of 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 LX > 5 x 1038 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 (LX > 5 x 1038 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.
Fabbiano Giuseppina
Kim Dong-Woo
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