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The Far- and Mid-Infrared/Radio Correlations in the Spitzer Extragalactic First Look Survey

Appleton, P. N. and Fadda, D. T. and Marleau, F. R. and Frayer, D. T. and Helou, G. and Condon, J. J. and Choi, P. I. and Yan, L. and Lacy, M. and Wilson, G. and Armus, L. and Chapman, S. C. and Fang, F. and Heinrichson, I. and Im, M. and Jannuzi, B. T. and Storrie-Lombardi, L. J. and Shupe, D. and Soifer, B. T. and Squires, G. and Teplitz, H. I. (2004) The Far- and Mid-Infrared/Radio Correlations in the Spitzer Extragalactic First Look Survey. Astrophysical Journal Supplement Series, 154 (1). pp. 147-150. ISSN 0067-0049. http://resolver.caltech.edu/CaltechAUTHORS:20170322-091729060

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Abstract

Using the Spitzer Space Telescope and the Very Large Array (VLA), we present the first direct evidence that the well-known far-infrared/radio correlation is valid to cosmologically significant redshift. We also confirm, with improved statistics compared with previous surveys, a similar result for the mid-IR/radio correlation. We explore the dependence of monochromatic q_(24) and q_(70) on z. The results were obtained by matching Spitzer sources at 24 and 70 μm with VLA 1.4 GHz microjansky radio sources obtained for the Spitzer First Look Survey (FLS). Spectroscopic redshifts have been obtained for over 500 matched IR/radio sources using observations at WIYN and Keck, and archival Sloan Digital Sky Survey (SDSS) data extending out to z > 2. We find that q_(24) shows significantly more dispersion than q_(70). By comparing the observed fluxes at 70, 24, and 4.5 μm with a library of SED templates, we find that the larger dispersion in q_(24) is predictable in terms of systematic variations in spectral energy distribution (SED) shape throughout the population. Although the models are not able to encompass the full range of observed behavior (both the presence of either extremely flat or extremely steep IR SEDs), the fitting parameters were used to "k-correct" the higher z galaxies, which resulted in a reduced scatter in q. For comparison, we also corrected these data using the SED for M82. The results for 24 and 70 μm provide strong consistent evidence for the universality of the mid- and far-IR/radio correlations out to redshifts of at least z = 1.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1086/422425DOIArticle
http://iopscience.iop.org/article/10.1086/422425/metaPublisherArticle
https://arxiv.org/abs/astro-ph/0406030arXivDiscussion Paper
https://doi.org/10.1086/426055ErrataErratum
ORCID:
AuthorORCID
Appleton, P. N.0000-0002-7607-8766
Condon, J. J.0000-0003-4724-1939
Yan, L.0000-0003-1710-9339
Lacy, M.0000-0002-3032-1783
Im, M.0000-0002-8537-6714
Storrie-Lombardi, L. J.0000-0002-5987-5210
Teplitz, H. I.0000-0002-7064-5424
Additional Information:© 2004 The American Astronomical Society. Received 2004 March 27; accepted 2004 May 5. This work is based (in part) 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 authors wish to thank V. Charmandaris (Cornell University), D. Dale (University of Wyoming), and an anonymous referee for helpful contributions to this work.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA1407
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:cosmology: observations — galaxies: evolution — galaxies: high-redshift — infrared: galaxies
Record Number:CaltechAUTHORS:20170322-091729060
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170322-091729060
Official Citation:P. N. Appleton et al 2004 ApJS 154 147
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75305
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Mar 2017 17:50
Last Modified:02 Nov 2017 21:35

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