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Probing Cool and Warm Infrared Galaxies Using Photometric and Structural Measures

Rahman, Nurur and Helou, George and Mazzarella, Joseph M. (2006) Probing Cool and Warm Infrared Galaxies Using Photometric and Structural Measures. Astrophysical Journal, 652 (2). pp. 1068-1076. ISSN 0004-637X.

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We have analyzed a sample of nearby cool and warm infrared (IR) galaxies using photometric and structural parameters. The set of measures include far-infrared color [C = log(S_(60 μm)/S_(100 μm))], total IR luminosity (L_TIR), radio surface brightness, and radio, near-infrared, and optical sizes. In a given luminosity range cool and warm galaxies are considered as those sources that are found approximately 1 σ below and above the mean color in the far-infrared C-L_TIR diagram. We find that galaxy radio surface brightness is well correlated with color whereas size is less well correlated with color. Our analysis indicates that IR galaxies that are dominated by cool dust are large, massive spirals that are not strongly interacting or merging and presumably the ones with the least active star formation. Dust in these cool objects is less centrally concentrated than in the more typical luminous and ultraluminous IR galaxies that are dominated by warm dust. Our study also shows that low-luminosity early-type unbarred and transitional spirals are responsible for the large scatter in the C-LTIR diagram. Among highly luminous galaxies, late-type unbarred spirals are predominately warm, and early-type unbarred and barred spirals are systematically cooler. We highlight the significance of the C-L_TIR diagram in terms of local and high-redshift submillimeter galaxies.

Item Type:Article
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URLURL TypeDescription
Mazzarella, Joseph M.0000-0002-8204-8619
Additional Information:© 2006 American Astronomical Society. Received 2006 July 10; accepted 2006 August 16. We thank the referee Jim Houck for insightful comments, and Thomas Jarrett for many useful communications. N. R. thanks Ranga Ram Chary, Roc Cutri, Justin Howell, Guilain Lagache, Seppo Laine, Naveen Reddy, Kevin Xu, Min Su Yun, and Zang Wang for discussions. N. R. gratefully acknowledges the support of a research associateship administered by the National Research Council (up to 2005 December) and the Oak Ridge Associated Universities (currently) during this research. This study has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and the LEDA database in France.
Funding AgencyGrant Number
National Research CouncilUNSPECIFIED
Subject Keywords:galaxies: active; galaxies: general; galaxies: spiral; galaxies: starburst; galaxies: structure
Record Number:CaltechAUTHORS:20110630-105626479
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Official Citation:Probing Cool and Warm Infrared Galaxies Using Photometric and Structural Measures Nurur Rahman et al. 2006 ApJ 652 1068
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24269
Deposited By: Jason Perez
Deposited On:30 Jun 2011 18:31
Last Modified:05 Oct 2017 21:15

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