Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9161s&link_type=abstract
HST Proposal ID #9161
Other
Hst Proposal Id #9161 Agn/Quasars
Scientific paper
The Two Micron All-Sky Survey {2MASS} is compiling a large sample of new, red, active galaxies. These objects add significantly to the number density of known active galactic nuclei {AGN} and could be important contributors to the cosmic far-infrared and X-ray backgrounds. The optical polarizations and near-IR-to-optical flux ratios of 2MASS AGN are generally higher than for UV-selected objects, indicating the presence of substantial obscuration toward the nuclear energy source. We propose STIS ultraviolet spectroscopy of a subset of 2MASS-discovered QSOs to: 1} determine if UV absorption- line features are present as seen in several other highly polarized AGN populations; 2} test relationships between X-ray {through an approved Chandra Cycle 2 GO program} and UV/optical attenuation, AGN spectral type, optical polarization, and detected UV absorption-line features; and 3} characterize the spectral energy distributions {SEDs} and UV properties of obscured QSOs. Comparison with AGN selected by other means will allow us to place the new sources in context, and in particular, whether they are the missing "obscured AGN" that are predicted by the Unified Scheme.
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