X-ray populations in galaxies

Abstract

Today's sensistive, high resolution Chandra X-ray observations allow the study of many populations of X-ray sources. The traditional astronomical tools of photometric diagrams and luminosity functions are now applied to these populations, and provide the means for classifying the X-ray sources and probing their evolution. While overall stellar mass drives the amount of X-ray binaries in old stellar population, the amount of sources in star-forming galaxies is related to the star formation rate. Shart-lived, luminous, high mass binaries (HNXBs) dominate these young populations.Comment: This is a review talk,to be published in the proceedings of the IAU Symposium 230, Populations of high energy sources in galaxies, held in Dublin (Ireland), August 15-19, 200