The Origin of the Hot Dust Poor Quasars

Details The Origin of the Hot Dust Poor Quasars The Origin of the Hot Dust Poor Quasars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943508h&link_type=abstract

American Astronomical Society, AAS Meeting #219, #435.08

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Scientific paper

In the XMM-COSMOS type 1 AGN sample, 10% of the quasar are identified to be hot dust poor (HDP, Hao et al. 2010). Similar fraction of the HDP are also found in other samples (Hao et al. 2011, Mor et al. 2011). These quasars have weak or non-existent near-IR bumps, suggesting a lack of the hot dust characteristic of AGNs. The 1-3micron emission is a factor 2-4 smaller than the typical E94 AGN SED. The implied `torus’ covering factor is 2%-29%, well below the 75% required by unified models.
The origin of the HDP quasars is unknown. We test on several possibilities as the first step. We compared the the HDP quasar distribution with the Volonteri & Madau (2008) estimation of off-nuclear AGN distribution and found that these two distributions match well with each other. Alternatively, we compared the distribution of the dust covering factor distribution of the XMM-COSMOS sample with the Lawrence & Elvis (2011) tilted disk model. The two distributions generally agrees with each other. The optical and X-ray spectrum and the far infrared SEDs still needs to be checked to get a clearer picture of the origin of HDP quasars.

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