70 Micron MIPS and Chandra ACIS-I Imaging of the IRAC Dark Field: Infrared AGN

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Chandra Proposal Id #08701041

Scientific paper

Using the Infrared Array Camera on-board Spitzer, we have been able to discover a population of objects with mid-infrared variability on months-timescales and whose colors are characteristic of active galactic nuclei (AGN). We request 26 hours of imaging at 70um with MIPS and 100 ksec of x-ray imaging with ACIS of the IRAC Dark Field. This is an extragalactic field 15 arcminutes in diameter near the north ecliptic pole. 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. This cannot be achieved with an ordinary science GO program, and this is the only mid-infrared dataset that will have this capability for the foreseeable future. (abridged from Spitzer proposal)

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