Evolution of Hot Dust Emission in z>6 Quasars

Details Evolution of Hot Dust Emission in z>6 Quasars Evolution of Hot Dust Emission in z>6 Quasars

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40356f&link_type=abstract

Spitzer Proposal ID #40356

Physics

Scientific paper

Strong hot dust emission from dust torus surrounding the central engine is an ubiquitous feature among Type-1 quasars at low redshift. In our previous GTO and GO-1 Spitzer programs, we observed a sample of quasars at 46 discovered in the last three years. The new observations will more than double the Spitzer sample size at z>6. All objects have excellent multiwavelength data, with BH mass estimates based on broad emission line width, and are GTO targets for Herschel at far-IR. With the combined Cycle 1/4 sample, we will (a) measure the fraction of quasars without hot dust emission at early epoch; (b) test the relation between hot dust properties and emission line properties, BH masses and accretion rates in quasars; (c) improve quasar IR SED measurements at z>6, and (d) probe the relation between hot and warm/cool dust traced by Herschel and sub/mm observations. In particular, three quasars in our new sample have similar emission line and BH properties to the two IR-weak quasars we found previously. We predict that they are likely candidates of new dust-deficient quasars at z>6.

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