The Einstein Cross Quasar: The Hottest Dust Around a Quasar in the Universe?

Details The Einstein Cross Quasar: The Hottest Dust Around a Quasar in the Universe? The Einstein Cross Quasar: The Hottest Dust Around a Quasar in the Universe?

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20475a&link_type=abstract

Spitzer Proposal ID #20475

Physics

Scientific paper

The Einstein Cross radio-quiet quasar images show microlensing by stars in the lens galaxy which allows constraints to be placed on the size of the ultraviolet and infrared emission regions. Preliminary ground-based data indicates that this quasar has the hottest dust of any known quasar. We propose to measure the mid-infrared spectral energy distribution with IRAC and IRS to determine whether most of the dust emission comes from dust near the sublimation temperature. In addition, we will look for the presence of PAH features. These measurements, in conjunction with microlensing measurements, will provide a probe of accretion disk physics, an indication of the dust composition, and an estimate of the size of the infrared emission region which can be used in simulations of lensing by dark matter substructure.

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