Constraining the Redshift Evolution of Off-Nuclear X-ray Sources using the Chandra Deep Fields.

Details Constraining the Redshift Evolution of Off-Nuclear X-ray Sources using the Chandra Deep Fields. Constraining the Redshift Evolution of Off-Nuclear X-ray Sources using the Chandra Deep Fields.

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717805l&link_type=abstract

American Astronomical Society Meeting 207, #178.05; Bulletin of the American Astronomical Society, Vol. 37, p.1453

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We analyze a population of intermediate-redshift (z = 0.05-0.3) off-nuclear X-ray sources located within the optical extent of optically-bright galaxies in the Great Observatories Origins Deep Survey (GOODS) and Galaxy Evolution from Morphology and SEDs (GEMS) fields. A total of 19 off-nuclear sources are classified using deep Chandra exposures from the Chandra Deep Field-North, Chandra Deep Field-South, and Extended Chandra Deep Field-South; ten of these sources are newly identified. These sources have average X-ray spectral shapes and optical environments similar to those of ultraluminous X-ray sources (ULXs) in the local univese. This sample improves the available source statistics for intermediate-redshift off-nuclear sources with 0.5-2.0 keV luminosities L{0.5-2.0 keV} > 1039.5 erg s-1, and places significant new constraints on the redshift evolution of the off-nuclear source frequency in field galaxies. We find that the fractions of intermediate-redshift field galaxies containing an off-nuclear source are elevated by a factor of two with respect to those observed for ULXs in the local universe for 0.5-2.0 keV luminosities in the range of 1039-40.5 erg s-1; the rise in these fractions is consistent with that expected from the observed increase in global star-formation density with redshift.

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