Evolution of Quasar Population at z 6

Details Evolution of Quasar Population at z 6 Evolution of Quasar Population at z 6

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4523j&link_type=abstract

American Astronomical Society, AAS Meeting #211, #45.23; Bulletin of the American Astronomical Society, Vol. 39, p.799

Astronomy and Astrophysics

Astronomy

Scientific paper

High-redshift (z 6) quasars provide direct probes of the distant universe when the first generation of galaxies and quasars formed. They are essential for studying the accretion history of supermassive black holes (BHs), galaxy formation, and chemical evolution in the first billion years. They also provide crucial information to the ionization state of the intergalactic medium at the end of reionization. Only less than 30 quasars at z 6 have been discovered thus far. In this poster we will present our spectroscopic survey of z 6 quasars in the Sloan Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by repeatedly scanning a 300 deg2 stripe along the Celestial Equator. We have completed the first part of the project and discovered six quasars in this region. They make a complete flux-limited quasar sample at zAB<21. From the combination of this sample and the SDSS luminous quasar sample, the slope of the QLF (-3.1±0.4) at z 6 is determined to be significantly steeper than the slope of the QLF at z 4. The steepening of the slope at z 6 has important consequences in understanding early BH growth in quasars. It also has a strong impact on the quasar contribution to the ionizing background. We will discuss its implications to cosmology in the poster. We will also present most recent results from the survey.
We acknowledge support from NSF grant AST-0307384, a Sloan Research Fellowship
and a Packard Fellowship for Science and Engineering (LJ, XF).

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