The obscured quasar population from optical, mid-infrared, and X-ray surveys
Abstract
Over the last few years, optical, mid-infrared and X-ray surveys have brought to light a significant number of candidate obscured AGN and, among them, many Type 2 quasars, the long-sought after "big cousins'' of local Seyfert 2 galaxies. However, despite the large amount of multi-wavelength data currently available, a proper census and a panchromatic view of the obscured AGN/quasar population are still missing, mainly due to observational limitations. Here we provide a review of recent results on the identification of obscured AGN, focusing primarily on the population of Type 2 quasars selected in the optical band from the Sloan Digital Sky Survey.
Keywords
Cite
@article{arxiv.0704.1298,
title = {The obscured quasar population from optical, mid-infrared, and X-ray surveys},
author = {C. Vignali and A. Comastri and D. M. Alexander},
journal= {arXiv preprint arXiv:0704.1298},
year = {2007}
}
Comments
6 pages, 2 figures, to appear in "At the Edge of the Universe: Latest results from the deepest astronomical surveys" (Sintra, Portugal, October 2006). Eds. J. Afonso, H. Ferguson, R. Norris, ASP conference series