AAS 205th Meeting, 9-13 January 2005
Session 63 Spitzer Views on Galaxy Evolution
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[63.05] Exploring the 24 micron counts beyond confusion

D. Fadda, F. R. Marleau (SSC/Caltech)

We present ultra-deep extra-galactic counts at 24 microns obtained from the HDF-North and ELAIS-N1 Spitzer public surveys. A total of 2000 and 1300 sources are detected in each field, respectively, down to a 3-sigma sensitivity limit of 20 micro-Jy. Using Monte Carlo simulations, we measure an 80% completeness limit of 80 micro-Jy and correct the counts down to the 50% completeness level. Beyond this limit, the extra-galactic confusion noise due to faint sources becomes important. We use simulations to reproduce the distribution of pixel fluxes in the 24 micron images, thereby estimating the counts down to a flux limit of 10 micro-Jy.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.