Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-01-19
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
6 pages, 3 figures. To appear in Proceedings of "X-ray Astronomy 2009: Present Status, Multi-Wavelength Approach and Future Pe
Scientific paper
We explore the connections between the infrared and X-ray properties of AGNs. Using the well constrained infrared SEDs of a sample of local (i.e., z < 0.1) sample of X-ray AGNs, we develop new diagnostics that exploit 24um and 70um flux densities to identify AGN-dominated systems at z<1.5 and measure their total infrared luminosities. We apply these diagnostics to the X-ray detected AGNs in the Chandra Deep Field South and, in doing so, reveal that the infrared to X-ray luminosity ratio was a factor of ~12 higher in the early Universe compared to today. We explore possible explanations for this dramatic evolution and demonstrate how forthcoming Herschel observations will discriminate between these scenarios and, while doing so, identify potential Compton-thick AGNs. Summary of Mullaney et al., MNRAS, 401, 995 (2010).
Alexander Dave M.
Mullaney James R.
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