Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...49l&link_type=abstract
Spitzer Proposal ID #49
Physics
Scientific paper
Near-infrared surveys are currently uncovering a large population of previously unidentified radio-quiet active galactic nuclei (AGN). The large IR-to-optical flux ratios of many of these objects suggest that their optical emission is largely obscured from our view. Optical spectropolarimetry of some of the most luminous examples of IR-selected AGN indicates that the optical radiation is not emitted isotropically, and that these objects would be indistinguishable from UV/optically-selected AGN if the nuclei were viewed from a different vantage point. The existence of a population of obscured AGN may increase the space density of AGN by a factor of two or more, and this has major implications for theories of the origin and evolution of these accretion-powered objects. The space density of AGN also has important implications for our understanding of the history of star formation in the early universe. This program will obtain MIPS observations of a large sample of confirmed AGN discovered by the Two-Micron All Sky Survey. These measurements will place infrared-selected AGN in context with traditional UV/optical and radio AGN samples.
Low Frank
Smith Paul
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