Ogle, P. M. and Antonucci, R. R. J. and Whysong, D. (2007) Mid-infrared Spectra of Radio Galaxies and Quasars. In: The Central Engine of Active Galactic Nuclei. ASP Conference Series (373). Astronomical Society of the Pacific , San Francisco, CA, pp. 578-581. ISBN 978-1-58381-307-2 http://resolver.caltech.edu/CaltechAUTHORS:20101105-092454502
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Spitzer Infrared Spectrograph (IRS) observations of 3C radio galaxies and quasars shed new light on the nature of the central engines of AGN. Emission from silicate dust obscuring the central engine can be used to estimate the bolometric luminosity of an AGN. Emission lines from ions such as O IV and Ne V give another indication of the presence or lack of a hidden source of far-UV photons in the nucleus. Radio-loud AGN with relative-to-Eddington luminosity ratios of L/L_(Edd) < 3 x 10^(−3) do not appear to have broad optical emission lines, though some do have strong silicate emission. Aromatic emission features from star formation activity are common in low-luminosity radio galaxies. Strong H2 pure-rotational emission lines are also seen in some mid-IR-weak radio galaxies, caused by either merger shocks or jet shocks in the interstellar medium.
|Item Type:||Book Section|
|Additional Information:||© 2007 Astronomical Society of the Pacific. This work is based on observations made with the Spitzer Space Telescope, operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. Support for this research was provided by NASA through an award issued by JPL/Caltech.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||05 Nov 2010 18:04|
|Last Modified:||26 Dec 2012 12:36|
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