Stellar populations, ages and velocity dispersions of the hosts of luminous type II quasars.

Details Stellar populations, ages and velocity dispersions of the hosts of luminous type II quasars. Stellar populations, ages and velocity dispersions of the hosts of luminous type II quasars.

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..493z&link_type=abstract

NOAO Proposal ID #2006B-0493

Computer Science

Scientific paper

The tight correlation between stellar velocity dispersions and the masses of the supermassive black holes in the centers of normal galaxies indicates that the formation processes of the two components were connected and that they are roughly coeval. However, there exist little observational evidence for an intensive formation of the stellar spheroid in the most luminous quasars, when the most massive black holes in the universe are growing most rapidly. This lack of evidence is primarily due to the significant observational difficulties of studying the hosts of bright quasars, when the host galaxy is overwhelmed by the quasar light. Type II quasars are luminous quasars whose optical light is obscured by large amounts of gas and dust very close to the nucleus. These objects offer a unique opportunity to study the hosts of the most luminous quasars in detail, unencumbered by the bright central source. We propose to conduct deep optical spectroscopy of type II quasars selected from the Sloan Digital Sky Survey. We will study the stellar populations of the hosts of type II quasars, measure the ages of starburst components, quantify the contribution of the scattered light from the nucleus and measure the central velocity dispersions of the hosts. The intrinsic luminosities of these objects are estimated to be M_B< -25.5, allowing us to probe the quasar luminosity regime which is usually inaccessible for such detailed quantitative studies.

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