Study of Galaxy Counts and Stellar Excesses in IRS Peak-Up Archival Observations

Details Study of Galaxy Counts and Stellar Excesses in IRS Peak-Up Archival Observations Study of Galaxy Counts and Stellar Excesses in IRS Peak-Up Archival Observations

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50640f&link_type=abstract

Spitzer Proposal ID #50640

Physics

Scientific paper

The IRS Peak-Up arrays are read out in parallel to every Short-Low spectrum taken during the Spitzer mission. We propose to mine this extensive set of more than 170,000 Peak-Up images, which are amply distributed across the sky. We propose to use these images for two main programs: (i) to study galaxy counts in moderately deep 16 micron images over a wide area; and (ii) to search for infrared excesses from stars. The 16 micron Peak-Up images include almost a square degree of low-background data at exposure times of at least 100 sec. Of these, about 300 square arcmin have exposure times greater than 15 minutes. These data will include 5,000--10,000 galaxies with 16-micron flux densities > 120 micro-Jy. This deep survey is unique because such coverage cannot be achieved in dedicated pointed observations, due to the small Peak-Up field of view. The IRS Peak-Up blue and red filters sample the SEDs of stellar sources at 16 and 22 microns. The stellar systems we will study are main-sequence and evolved stars. We expect to detect at least several hundred stars in the Peak-Up images, and expect to find excesses in about 10% of main-sequence stars, plus a higher percentage of dust shells around evolved stars. The intended goal of this study is the detection of new and unique phenomenology in main-sequence and evolved stars. We propose to release catalogs of point sources, as added-value products for the community. Through this program we will expand the impact of Spitzer observations for ancillary discoveries.

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