Mid-Infrared Variability of Radio-Loud AGN

Details Mid-Infrared Variability of Radio-Loud AGN Mid-Infrared Variability of Radio-Loud AGN

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50099r&link_type=abstract

Spitzer Proposal ID #50099

Computer Science

Scientific paper

Initial results for our MIPS Cycle 4 GTO program to measure the flux variability of 142 low-redshift AGNs at 24 microns include the finding that radio-quiet objects are not variable at a level of >2% over a time scale of 1-3 years. Of the 30 radio-quiet objects observed so far at two epochs, none show evidence of variability despite the targets having being drawn from various optical, near-IR (2MASS), and IRAS samples. This result argues against nonthermal emission as a significant contributor to the IR flux for both types 1 and 2 radio-quiet AGN. In contrast, 11 of 27 radio-loud AGN varied by >5% in flux density at 24 microns. These objects include gamma-ray-detected flat-spectrum radio sources and Fanaroff-Riley types I and II radio galaxies. As expected, the gamma-ray detected AGN show the highest degree of variability (e.g., PKS 1510-089 was found to be more than a factor of 3 brighter two years after it was first observed with MIPS). Unexpectedly, however, little evidence for variability was found for the three X-ray selected BL Lac objects observed so far. We propose a third epoch of 24 micron flux density measurements for the radio-loud portion of the sample (57 objects). These observations will confirm marginal variability detections from the first two epochs and allow for a more robust comparison of the variability amplitudes for various classes of radio-loud AGN.

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