A Snapshot Survey of the Optically Selected Type-2 Quasars

Details A Snapshot Survey of the Optically Selected Type-2 Quasars A Snapshot Survey of the Optically Selected Type-2 Quasars

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9145d&link_type=abstract

HST Proposal ID #9145

Computer Science

Hst Proposal Id #9145 Agn/Quasars

Scientific paper

We identified a population of emission-line objects in DPOSS, which can be plausibly interpreted as the long-sought type-2 quasars. They have high-ionization Seyfert-2 like spectra, but with narrow-line luminosities comparable to those of the luminous type-1 quasars in the same redshift range. Keck spectropolarimetry confirms the presence of hidden QSO nuclei in them. This provides a major piece of evidence in favor of the unified schemes for AGN, and it should help extend our understanding of AGN in general. This population may be a major contributor to the cosmic hard x-ray background. It is complementary to the optically dull hard x-ray sources found by Chandra. We propose to obtain multi-color images of a representative sample of these objects, in order to examine their morphology with the superior angular resolution of the HST. We may be able to detect point-like nuclei which are not detectable in ground-based images, the dust lanes hiding them from our view, possible evidence for tidal interactions and the overall morphology of their hosts, etc. We also propose for Chandra observations for a subsample of 5 objects, in order to probe the column densities of the obscuring material and to constrain their bolometric luminosities. This study would greatly increase our understanding of these objects, which are an important missing link in the overall picture of AGN populations in the universe.

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