Colloquium

The Evolution of Quasars with Cosmic Time

While the luminosity and mass distributions of quasars has evolved dramatically with cosmic time, the physical properties of quasars of a given luminosity are remarkably independent of redshift. I will describe recent results on the spectra of luminous quasars, the dark matter halos in which they sit, and the intergalactic medium of their host galaxies, that are essentially indistinguishable from moderate redshifts to z>6. The one property apparently unique to the highest-redshift quasars is that some small fraction show evidence for having very little infrared excess from hot dust. Dust obscuration is another theme in quasar studies; an appreciable fraction of the growth of black holes may be hidden at optical wavelengths by dust. I will vdescribe searches for obscured quasars at high redshift and low, and studies of their demographics and physical properties. I will conclude the talk with a discussion of future surveys, including the next generation of wide-field imaging and spectroscopic surveys with the 8.2-meter Subaru Telescope.

Followed by wine and cheese in Pupin 1402.

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