The 4 Ms Chandra Deep Field-South Survey Number Counts: The Impending Dominance of Normal Galaxy Populations in Ultra-Deep X-ray Surveys

Details The 4 Ms Chandra Deep Field-South Survey Number Counts: The Impending Dominance of Normal Galaxy Populations in Ultra-Deep X-ray Surveys The 4 Ms Chandra Deep Field-South Survey Number Counts: The Impending Dominance of Normal Galaxy Populations in Ultra-Deep X-ray Surveys

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942818l&link_type=abstract

American Astronomical Society, AAS Meeting #219, #428.18

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. In this poster I will present the latest estimates of the extragalactic X-ray source number counts emphasizing the nature of the sources that contribute at the faintest flux levels. We find that the majority of the 740 X-ray detected sources in the 4 Ms CDF-S are active galactic nuclei (AGNs); however, 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 8.6 X 10-18 ergs/cm2/s. I will present a detailed break-down of the X-ray number count contributions based on a variety of source properties (e.g., AGN redshift, intrinsic column density, and X-ray luminosity and galaxy optical morphology) and implications for semi-analytic models that attempt to parameterize the SMBH accretion history and X-ray binary evolution in the Universe. I will present predictions for future X-ray surveys (e.g., via Chandra and future X-ray observatories) that probe sensitivity levels fainter than the CDF-S.

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