Cadenced IRAC Monitoring of Infrared-Variable AGNs, Part III

Details Cadenced IRAC Monitoring of Infrared-Variable AGNs, Part III Cadenced IRAC Monitoring of Infrared-Variable AGNs, Part III

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60121a&link_type=abstract

Spitzer Proposal ID #60121

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Scientific paper

We have analyzed IRAC imaging data from all 109 Spitzer visits to a very well-studied field, the IRAC Dark Calibration Field (IRAC-CF) near the north ecliptic pole. With this extensive dataset, we have already identified a unique sample of 30 IR-variable galaxies for which we are now working to characterize the variability amplitudes and timescales, panchromatic SEDs, and host morphologies, among other quantities. Unfortunately, the continual change in spacecraft roll angle means that our sources are typically observed for at most six months at a time by both IRAC FOVs in succession -- in other words, the visibility windows are exactly out of phase. Thus the planned Cycle 6 IRAC calibration observations, without the additional coverage our proposal would provide, will present large, unavoidable gaps that frustrate the time-delay analysis we wish to perform on exactly the timescales known to be typical of active galaxies. Since 2007 July, we have carried out cadenced IRAC observations in synchrony with the IRAC-CF dark-calibration observations as part of our approved Cycle 4 and 5 programs. We propose to continue this unique AGN monitoring campaign into 2010. The resulting timelines (covering 2000 days thus far and expected to run ultimately to more than 2400 days), are a unique legacy of the Spitzer mission. This dataset, especially for the sizable unbiased AGN sample we now have, holds unique promise for measuring the colors and temperatures of IR-varying AGN, and will have much to say about the underlying physical models of the infrared AGN emission. Accordingly, we ask for just 8 h to gather IRAC photometry in the temporal gaps that would otherwise accrue in Cycle 6.

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