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

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

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30222s&link_type=abstract

Spitzer Proposal ID #30222

Computer Science

Scientific paper

Using data taken for the calibration 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) at significantly high redshift. We request 25.5 hours of imaging at 70 microns with MIPS and 100 ksec of x-ray imaging with ACIS of the IRAC Dark Field. The 70 micron data are needed to provide a photometric data point near the peak of the spectral energy distribution, allowing an accurate determination of the spectral shape and bolometric luminosity. These are known to correlate locally with the nature of the energy source and will help provide a discriminant between AGN-like and starburst-like systems. The x-ray imaging provides an additional measure of the strength of AGN activity and the degree of obscuration to the energy source. This 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, the field 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. This cannot be achieved with an ordinary science GO program, and this is the only mid-infrared dataset that will have this capability at this depth for the foreseeable future. In the past year we have acquired deep multiband optical and near-IR imaging from the ground, and will soon acquire deep high spatial resolution HST imaging. All HST/Spitzer data in the field is publicly available, and the requested MIPS and Chandra data will add to this unique dataset.

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