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Departmental Colloquium


Quasars at high redshift: Correlations, Lifetimes, and Reionization

Prof. Michael Strauss
Princeton University

Time
 
Wed. November 1, 2006     3:30 PM     Stirling A

Abstract
 
The Sloan Digital Sky Survey has discovered over 6000 quasars with redshifts greater than three. I will discuss two recent results drawn from this sample. The first examines the clustering of these quasars; they turn out to be very strongly biased relative to the underlying dark matter, implying that they are associated with very rare, massive dark matter halos. The second looks at the most distant quasars, at redshifts of order 6. They probe the intergalactic medium less than a billion years after the Big Bang; the data imply that the universe was in transition from a neutral to almost fully ionized state, as the first generation of stars and galaxies formed.

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