NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-16 T09:19:23 PST
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For refcode 2006AJ....131..250F:
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Copyright by American Astronomical Society. Reproduced by permission
2006AJ....131..250F Spitzer 70 and 160 microns Observations of the Extragalactic First Look Survey D. T. Frayer, D. Fadda, L. Yan, F. R. Marleau, P. I. Choi, G. Helou, B. T. Soifer, P. N. Appleton, L. Armus, R. Beck, H. Dole, C. W. Engelbracht, F. Fang, K. D. Gordon, I. Heinrichsen, D. Henderson, T. Hesselroth, M. Im, D. M. Kelly, M. Lacy, S. Laine, W. B. Latter, W. Mahoney, D. Makovoz, F. J. Masci, J. E. Morrison, M. Moshir, A. Noriega-Crespo, D. L. Padgett, M. Pesenson, D. L. Shupe, G. K. Squires, L. J. Storrie-Lombardi, J. A. Surace, H. I. Teplitz, and G. Wilson Abstract. We present 70 and 160 microns observations from the Spitzer extragalactic First Look Survey (xFLS). The data reduction techniques and the methods for producing co-added mosaics and source catalogs are discussed. Currently, 26% of the 70 microns sample and 49% of the 160 microns -- selected sources have redshifts. The majority of sources with redshifts are star-forming galaxies at z<0.5, while about 5% have infrared colors consistent with active galactic nuclei. The observed infrared colors agree with the spectral energy distributions (SEDs) of local galaxies previously determined from IRAS and Infrared Space Observatory data. The average 160 microns/70 microns color temperature for the dust is T_d_=~30+/-5 K, and the average 70 microns/24 microns spectral index is {alpha}=~2.4+/-0.4. The observed infrared-to-radio correlation varies with redshift as expected out to z~1 based on the SEDs of local galaxies. The xFLS number counts at 70 and 160 microns are consistent within uncertainties with the models of galaxy evolution, but there are indications that the current models may require slight modifications. Deeper 70 microns observations are needed to constrain the models, and redshifts for the faint sources are required to measure the evolution of the infrared luminosity function. Key words: Galaxies: Evolution, Galaxies: Starburst, Infrared: Galaxies
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