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350 μm observations of local luminous infrared galaxies and the temperature dependence of the emissivity index

Yang, M. and Phillips, T. G. (2007) 350 μm observations of local luminous infrared galaxies and the temperature dependence of the emissivity index. Astrophysical Journal, 662 (1). pp. 284-293. ISSN 0004-637X. doi:10.1086/514810.

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We report 350 μm observations of 18 nearby luminous infrared galaxies (LIRGs) using the Submillimeter High Angular Resolution Camera II (SHARC-II) mounted on the Caltech Submillimeter Observatory (CSO) 10.4 m telescope. Combining our 350 μm flux measurements with the existing far-infrared (FIR) and submillimeter data, we fit a single-temperature model to the spectral energy distributions (SEDs) and find the dust temperatures, emissivity indices, and FIR luminosities having sample medians of T_d = 39.4 ± 7.9 K, β = 1.6 ± 0.3, and LFIR = 10^(11.2±0.6) L⊙. An empirical inverse T_d-β correlation, best described by T_d = (9.86 × 10^9)^(1/(4.63 + β)), is established for the local LIRG sample, which we argue can be explained by the intrinsic interdependence between the dust temperature and grain emissivity index as physical parameters, as well as variations in grain properties in the interstellar medium (ISM).

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Additional Information:© 2007 The American Astronomical Society. Received 2006 November 22; accepted 2007 February 12. We would like to thank J. Zmuidzinas, A. Blain, T. Soifer, T. Greve, and C. Dowell for helpful discussions. We are grateful to the referee for improving this paper through thoughtful comments. The CSO is supported by the NSF fund under contract AST 02-29008.
Funding AgencyGrant Number
NSFAST 02-29008
Subject Keywords:dust, extinction; infrared: galaxies; submillimeter
Issue or Number:1
Record Number:CaltechAUTHORS:YANapj07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13785
Deposited By: Tony Diaz
Deposited On:10 Jul 2009 21:26
Last Modified:08 Nov 2021 22:40

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