High-redshift obscured quasars

Details High-redshift obscured quasars High-redshift obscured quasars

2007-01-05

arxiv.org/abs/astro-ph/0701143v2

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M.

Scientific paper

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.

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