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Spitzer 70 and 160 μm Observations of the Extragalactic First Look Survey

Frayer, D. T. and Fadda, D. and Yan, L. and Marleau, F. R. and Choi, P. I. and Helou, G. and Soifer, B. T. and Appleton, P. N. and Armus, L. and Beck, R. and Dole, H. and Engelbracht, C. W. and Fang, F. and Gordon, K. D. and Heinrichsen, I. and Henderson, D. and Hesselroth, T. and Im, M. and Kelly, D. M. and Lacy, M. and Laine, S. and Latter, W. B. and Mahoney, W. and Makovoz, D. and Masci, F. J. and Morrison, J. E. and Moshir, M. and Noriega-Crespo, A. and Padgett, D. L. and Pesenson, M. and Shupe, D. L. and Squires, G. K. and Storrie-Lombardi, L. J. and Surace, J. A. and Teplitz, H. I. and Wilson, G. (2006) Spitzer 70 and 160 μm Observations of the Extragalactic First Look Survey. Astronomical Journal, 131 (1). pp. 250-260. ISSN 0004-6256.

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We present 70 and 160 μm 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 μm sample and 49% of the 160 μm–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 μm/70 μm color temperature for the dust is T_d ≃ 30 ± 5 K, and the average 70 μm/24 μm spectral index is α ≃ 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 μm are consistent within uncertainties with the models of galaxy evolution, but there are indications that the current models may require slight modifications. Deeper 70 μm observations are needed to constrain the models, and redshifts for the faint sources are required to measure the evolution of the infrared luminosity function.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Frayer, D. T.0000-0003-1924-1122
Fadda, D.0000-0002-3698-7076
Yan, L.0000-0003-1710-9339
Helou, G.0000-0003-3367-3415
Appleton, P. N.0000-0002-7607-8766
Armus, L.0000-0003-3498-2973
Im, M.0000-0002-8537-6714
Lacy, M.0000-0002-3032-1783
Laine, S.0000-0003-1250-8314
Masci, F. J.0000-0002-8532-9395
Noriega-Crespo, A.0000-0002-6296-8960
Padgett, D. L.0000-0001-5334-5107
Shupe, D. L.0000-0003-4401-0430
Squires, G. K.0000-0002-1977-5717
Storrie-Lombardi, L. J.0000-0002-5987-5210
Surace, J. A.0000-0001-7291-0087
Teplitz, H. I.0000-0002-7064-5424
Alternate Title:Spitzer 70 and 160-micron Observations of the Extragalactic First Look Survey
Additional Information:© 2006 The American Astronomical Society. Received 2005 August 1; accepted 2005 September 21. We thank all of our colleagues associated with the Spitzer mission who have made these observations possible. 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: evolution; galaxies: starburst; infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20170328-075452484
Persistent URL:
Official Citation:D. T. Frayer et al 2006 AJ 131 250
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75460
Deposited By: Tony Diaz
Deposited On:28 Mar 2017 15:56
Last Modified:09 Mar 2020 13:19

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