NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-13 T10:41:56 PST
Help | Comment | NED Home

For refcode 2005ApJ...629...88S:
Retrieve 47 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...629...88S Far-Infrared Observations of Radio Quasars and FR II Radio Galaxies Shi, Y.; Rieke, G. H.; Hines, D. C.; Neugebauer, G.; Blaylock, M.; Rigby, J.; Egami, E.; Gordon, K. D.; Alonso-Herrero, A. Abstract. We report MIPS photometry of 20 radio-loud quasars and galaxies at 24 and 70 microns (and of five at 160 microns). We combine this sample with additional sources detected in the far-infrared by IRAS and ISO for a total of 47 objects, including 23 steep-spectrum type I AGNs: radio-loud quasars and broad-line radio galaxies; and 24 type II AGNs: narrow-line and weak-line FR II radio galaxies. Of this sample, the far-infrared emission of all but 3C 380 appears to be dominated by emission by dust heated by the AGN and by star formation. The AGN appears to contribute more than 50% of the far-infrared luminosity in most of the sources. It is also expected that the material around the nucleus is optically thin in the far-infrared. Thus, the measurements at these wavelengths can be used to test the orientation-dependent unification model. As predicted by the model, the behavior of the sources is consistent with the presence of an obscuring circumnuclear torus; in fact, we find that it may still have significant optical depth at 24 microns. In addition, as expected for the radio-loud quasars, there is a significant correlation between the low-frequency radio (178 MHz) and the 70 microns emission, two presumably isotropic indicators of nuclear activity. This result is consistent with the simple unified scheme. However, there is a population of radio galaxies that are underluminous at 70 microns compared with the radio-loud quasars and hence are a challenge to the simple unified model. Keywords: Galaxies: Active, Infrared: Galaxies, Galaxies: Quasars: General
Retrieve 47 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home