Mid-Infrared Variability from AGN in the IRAC Dark Field: Photometric Refinement, Discovery, and Characterization

Details Mid-Infrared Variability from AGN in the IRAC Dark Field: Photometric Refinement, Discovery, and Characterization Mid-Infrared Variability from AGN in the IRAC Dark Field: Photometric Refinement, Discovery, and Characterization

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30390s&link_type=abstract

Spitzer Proposal ID #30390

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Scientific paper

We request archival funding to support an investigation into the mid-infrared variability of AGN discovered in the IRAC Dark Field. The requested funding is needed to refine the photometric accuracy of the IRAC calibration as a function of both array position and time, allowing detection of much smaller effects than could be achieved from the SSC pipeline data products. As part of this we propose to use more sophisticated search techniques to expand the range of detectable variability to smaller amplitudes and timescales than we have already found. This may also uncover supernova signatures and other periodic variations. The field itself is an extragalactic field 15 arcminutes in diameter near the north ecliptic pole, and is the dark current calibration target for IRAC. Because it is observed frequently as part of routine operations, it is now similar in size and depth to the infrared component of the GOODS program, and is confusion-limited in the mid-infrared. More importantly, due to the periodicity of the observations, the Spitzer data are sensitive to variability on week timescales, ultimately spanning a baseline of five to seven years, and are the only mid-infrared dataset that will have this capability at this depth for the foreseeable future. This work will have a significant impact on other studies both by producing a comprehensive look at variability in deep mid-IR surveys, and also through the development of advanced data reduction techniques that can be applied to other programs for the purpose of refining IRAC's relative photometric accuracy.

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