"Hidden" Seyfert 2 Galaxies in the Chandra Deep Field North
Carolin N. Cardamone (Yale), Edward C. Moran (Wesleyan), Laura E. Kay, (Barnard)

TL;DR
This study compares local Seyfert 2 galaxies with distant absorbed AGNs in the Chandra Deep Field North, finding their properties consistent and suggesting many distant sources are obscured Seyfert 2s due to observational effects.
Contribution
It demonstrates that local Seyfert 2 galaxies can account for the properties of distant absorbed AGNs, supporting the idea that many are hidden by observational limitations.
Findings
Excellent agreement between simulations and observed flux ratios.
No significant physical differences between local Seyfert 2s and distant absorbed AGNs.
Supports the hypothesis that many distant AGNs are obscured Seyfert 2s.
Abstract
We have compared the X-ray--to--optical flux ratios (F_x/F_opt) of absorbed active galactic nuclei (AGNs) in the Chandra Deep Field North (CDF-N) with those of nearby, optically classified Seyfert 2 galaxies. The comparison provides an opportunity to explore the extent to which the local population of absorbed AGNs can account for the properties of the distant, spectroscopically ambiguous sources that produce the hard X-ray background. Our nearby sample consists of 38 objects that well represent the local Seyfert 2 luminosity function. Integrated UBVRI photometry and broadband X-ray observations are presented. Using these data, we have simulated the F_x/F_opt ratios that local Seyfert 2s would exhibit if they were observed in the redshift range 0.2 < z < 1.3 as part of the CDF-N. In the simulations we account for the effects of redshift on flux measurements in fixed observed-frame…
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