New frontiers opened by Chandra in cosmological studies of galaxies

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The deepest extragalactic X-ray surveys with Chandra show that galaxies are beginning to rival AGN as the most numerous point source populations at the faintest X-ray fluxes. These X-ray detected galaxies provide probes of X-ray binaries and hot gas in galaxies over important Gyr time-scales that simply were not accessible before the Chandra mission. However, most distant (z>0.2) Chandra studies of the evolution of X-ray emission from star-forming galaxies are severely limited by the lack of highly complete observed X-ray samples in the local Universe. This poster reviews recent progress in X-ray studies of star-forming galaxies and discusses new results arising from archival Chandra studies of galaxies in the Sloan Digital Sky Survey Data Release 2 (SDSS DR2) and of pointed X-ray observations in the Coma cluster of galaxies. These projects are filling in the ``local'' observational needs of deep X-ray surveys.

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