X-ray Luminosity Function of Point Sources in Early Type Galaxies and its Implication on Measurement of Metal Abundance

Details X-ray Luminosity Function of Point Sources in Early Type Galaxies and its Implication on Measurement of Metal Abundance X-ray Luminosity Function of Point Sources in Early Type Galaxies and its Implication on Measurement of Metal Abundance

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17098k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

High spatial resolution Chandra observations of early type galaxies have resolved many point sources (often up to 100) within optical radii. Their individual and integrated spectra are hard ( 5 keV) and their radial distributions are consistent with those of optical (ie., stellar) surface brightness, implying that most of them are LMXB as suggested by previous X-ray missions. Taking into account the incompleteness of the X-ray luminosity function (XLF) at the faint end due to the low detection probability (caused by the high background near the center and by large PSFs at the outskirts), we conclude that the XLF is well reproduced by a single power law with a slope of about -1.5, indicating a considerable number of point sources undetectable even in the Chandra observations. Adding the hidden population to the X-ray spectral fitting of diffuse X-ray emission does not support very low metal abundance (10-20often required in a single component spectral fitting.

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