Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4509m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #45.09; Bulletin of the American Astronomical Society, Vol. 39, p.797
Astronomy and Astrophysics
Astronomy
Scientific paper
The radio-loud vs. radio-quiet dichotomy observed in quasars may be a result of different accretion modes or black hole spin. Infrared wavelengths can be used to study the accretion properties of a black hole, since a significant portion of the AGN radiation is absorbed and reprocessed by dust. We analyze mid-infrared spectra of the complete sample of 88 PG Quasars at z < 0.5 taken by the Spitzer Space Telescope. This sample has a combination of radio-quiet and loud sources, and the spectra reveal a variety of galaxy types, from AGN-dominated to those with considerable star formation. Measured spectral energy distributions show a broad range of dust temperatures. We present infrared flux measurements and examine correlations with the x-ray, optical and radio properties of the PG quasars, with the goal exploring the origin of radio-loudness.
Antonucci Robert
Leipski Christian
Meyer Jillian M.
Ogle Patrick M.
Whysong David
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