Infrared Spectral Energy Distributions of the Most Distant Quasars

Details Infrared Spectral Energy Distributions of the Most Distant Quasars Infrared Spectral Energy Distributions of the Most Distant Quasars

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3198f&link_type=abstract

Spitzer Proposal ID #3198

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Scientific paper

We propose to obtain high S/N Spitzer photometry of a flux-limited sample of thirteen luminous quasars at 5.7 < z < 6.4 selected from the Sloan Digital Sky Survey. They are the thirteen most distant quasars known to date, near the end of the cosmic reionization epoch. The Spitzer observations will be carried out in all the IRAC bands, the MIPS 24 micron band, and for the brightest sources, in the MIPS 70 micron band. These observations will provide the first high S/N Spitzer measurement of luminous objects at z>6, and establish the basic infrared characteristics of the most distant quasars. The Spitzer observations sample the rest-frame near to mid-IR, a wavelength range that has never been probed before at this redshift, where the radiation begins to be dominated by hot dust in the quasar environment and where the SED might peak. High quality X-ray, optical/near-IR, sub-millimeter and radio observations of this sample have either been acquired or planned. Combined with measurements in other wavelengths, the Spitzer data will allow us to measure the bolometric luminosity of z~6 quasars and to estimate the accretion rate and efficiency of the earliest billion solar mass black holes in the universe. Comparing with low-redshift samples, including the Spitzer GTO sample at 0 < z < 5, we will study the evolution of quasar SEDs to the first billion years of cosmic history, constraining physical models of the highest-redshift quasars. Finally, combining with sub-millimeter and radio molecular gas observations, we will study dust properties in the quasar environment and the AGN/starburst connection in the earliest massive galaxies.

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