Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21820902l&link_type=abstract
American Astronomical Society, AAS Meeting #218, #209.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Through a large investment of director's discretionary time, the Chandra Deep Field-South (CDF-S) now has a total ACIS-I exposure reaching 4 Ms in depth, making the CDF-S the deepest X-ray observation of the extragalactic Universe ever undertaken. Although the majority of the 740 X-ray detected sources in the 4 Ms CDF-S are AGNs, we estimate that normal galaxies shining primarily by emission from X-ray binaries and hot gas contribute 40% of the total number counts above 0.5-2 keV fluxes of 10^-17 ergs/cm2/s. We show that the increase in the normal galaxy contribution to the number counts is consistent with that expected from increasing contributions from distant star-forming galaxies, provided the X-ray/SFR correlation holds out to at least z 1. Using the multiwavelength data available in the CDF-S and X-ray stacking methods, we show that the X-ray power output from the star-forming galaxy population as a whole evolves significantly out to z 1.5, directly following the evolution of the star-formation rate density of the Universe. These results suggest that much of the evolution of the X-ray emission can be attributed to changes in the X-ray binary populations within the star-forming galaxies, since X-ray binaries are responsible for driving the local X-ray/SFR correlation. We discuss efforts to incorporate advanced X-ray binary population synthesis models describing the evolution of the X-ray binary activity in the star-forming galaxy population and present initial physical insight provided by these models.
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