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Published November 2005 | Published + Submitted
Journal Article Open

The Infrared Array Camera Component of the Spitzer Space Telescope Extragalactic First Look Survey


We present Infrared Array Camera (IRAC) data and source catalogs from the Spitzer Space Telescope Extragalactic First Look Survey. The data were taken in four broad bands centered at nominal wavelengths of 3.6, 4.5, 5.8, and 8.0 μm. A set of mosaics and catalogs have been produced that are ≈80% complete and ≈99% reliable to their chosen flux density limits. The main field survey covers 3.8 deg^2 and has flux density limits of 20, 25, 100, and 100 μJy at wavelengths of 3.6, 4.5, 5.8, and 8.0 μm, respectively. The deeper "verification" survey covers 0.25 deg^2 with limits of 10, 10, 30, and 30 μJy, respectively. We also include deep data in the ELAIS-N1 field, which covers 0.041 deg2 with limits of 4, 3, 10, and 10 μJy, respectively, but with only two wavelength coverages at a given sky position. The final bandmerged catalogs contain 103,193 objects in the main field, 12,224 in the verification field, and 5239 in ELAIS-N1. Flux densities of high signal-to-noise objects are accurate to about 10%, and the residual systematic error in the absolute flux density scale is ~2%-3%. We have successfully extracted sources at source densities as high as 100,000 deg-2 in our deepest 3.6 and 4.5 μm data. The mosaics and source catalogs will be made available through the Spitzer Science Center archive and the Infrared Science Archive.

Additional Information

© 2005 The American Astronomical Society. Received 2004 December 30; accepted 2005 June 8. We thank the other members of the IRAC instrument/instrument support team, in particular Sean Carey, for helpful discussions, and Dan Stern and Lexi Moustakas for making their software available. We also thank I. Drozdovsky for supplying the mosaics of the ACS data in the XFLS field, and the anonymous referee for helpful comments. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. The Two Micron All Sky Survey (2MASS) is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration (NASA) and the National Science Foundation (NSF).

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Published - Lacy_2005_ApJS_161_41.pdf

Submitted - 0507143.pdf


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