High-redshift obscured quasars
Astrophysics
2007-05-23 v2
Abstract
Using mid-infrared and radio criteria, we select a sample of candidate z~2 obscured quasars. Optical spectroscopy confirms about half of these as type-2 quasars, and modelling the population suggests 50-80% of the quasars are obscured. We find some flat radio spectrum type-2 quasars, and tentative evidence for obscuration unrelated to the torus. Using a similar sample, we also find evidence for a significant fraction of Compton-thick quasars.
Keywords
Cite
@article{arxiv.astro-ph/0701143,
title = {High-redshift obscured quasars},
author = {Alejo Martinez-Sansigre and Steve Rawlings},
journal= {arXiv preprint arXiv:astro-ph/0701143},
year = {2007}
}
Comments
4 pages, 1 figure. Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San Francisco: ASP)