Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915407n&link_type=abstract
American Astronomical Society, AAS Meeting #219, #154.07
Astronomy and Astrophysics
Astrophysics
Scientific paper
We match the NEWFIRM Medium-Band Survey (NMBS) K-selected catalogs in COSMOS and AEGIS to the corresponding Chandra X-ray catalogs. We use the photometric redshift code EAZY and a modified template set including Type-1 and Type-2 AGN templates to derive improved photometric redshift estimates. The resulting photometric redshift estimates are excellent, with median in Δz/(1+z) of -0.001 and σNMAD=0.015, with a fraction of catastrophic outliers of 17.5%. Compared to the non X-ray sources, the photometric redshifts are only slightly less accurate, although the fraction of catastrophic outliers in the X-ray sources is a factor of 4 larger than for the non X-ray sources. We derive rest-frame spectral energy distributions (SEDs) of all X-ray detected sources, exploiting the exquisitely sampled SEDs from NMBS, and study how the rest-frame SEDs of X-ray sources 1) depend on the X-ray luminosity and 2) evolve with redshift. In general, we find little evolution with redshift of the rest-frame SEDs of X-ray detected galaxies. On the contrary, the rest-frame SEDs strongly depend on the X-ray luminosity, with larger emission at both UV-optical and MIR wavelengths in brighter X-ray sources. By decoupling the contributions of the AGN and the host galaxy to the SED, we find that the dependency of the rest-frame SED on X-ray luminosity is consistent with an increasing fraction of Type-1 AGNs with increasing X-ray luminosity at fixed redshift. Finally, for the brightest X-ray sources (log(LX)>44.4), we find a decreasing fraction of Type-1 AGN with increasing redshift, from fType1 67% at z=1.2 to fType1 22% at z=3.5, indicative of larger dust obscuration at higher redshifts.
Marchesini Danilo
Natalie Perry
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