Mid-infrared Spectra of Radio Galaxies and Quasars
- Creators
-
Ogle, P. M.
- Antonucci, R. R. J.
- Whysong, D.
- Others:
- Ho, Luis C.
- Wang, Jian-Min
Abstract
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.
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.Attached Files
Published - Ogle2007p8630Central_Engine_Of_Active_Galactic_Nuclei.pdf
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Additional details
- Eprint ID
- 20682
- Resolver ID
- CaltechAUTHORS:20101105-092454502
- 1407
- NASA
- NASA/JPL/Caltech
- Created
-
2010-11-05Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)
- Series Name
- ASP Conference Series
- Series Volume or Issue Number
- 373