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Far-infrared Properties of Spitzer-selected Luminous Starbursts

Kovács, A. and Omont, A. and Beelen, A. and Lonsdale, C. J. and Polletta, M. and Fiolet, N. and Greve, T. R. and Borys, C. and Cox, P. and de Breuck, C. and Dole, H. and Dowell, C. D. and Farrah, D. and Lagache, G. and Menten, K. M. and Bell, T. A. and Owen, F. (2010) Far-infrared Properties of Spitzer-selected Luminous Starbursts. Astrophysical Journal, 717 (1). pp. 29-39. ISSN 0004-637X.

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We present SHARC-2 350 μm data on 20 luminous z ~ 2 starbursts with S_(1.2 mm) > 2 mJy from the Spitzer-selected samples of Lonsdale et al. and Fiolet et al. All the sources were detected, with S_(350) μm > 25 mJy for 18 of them. With the data, we determine precise dust temperatures and luminosities for these galaxies using both single-temperature fits and models with power-law mass-temperature distributions. We derive appropriate formulae to use when optical depths are non-negligible. Our models provide an excellent fit to the 6 μm-2 mm measurements of local starbursts. We find characteristic single-component temperatures T_1 ≃ 35.5 ± 2.2 K and integrated infrared (IR) luminosities around 10^(12.9 ± 0.1) L_☉ for the SWIRE-selected sources. Molecular gas masses are estimated at ≃4 × 10^(10) M_☉, assuming κ_(850 μm) = 0.15 m^2 kg^(–1) and a submillimeter-selected galaxy (SMG)-like gas-to-dust mass ratio. The best-fit models imply ≳2 kpc emission scales. We also note a tight correlation between rest-frame 1.4 GHz radio and IR luminosities confirming star formation as the predominant power source. The far-IR properties of our sample are indistinguishable from the purely submillimeter-selected populations from current surveys. We therefore conclude that our original selection criteria, based on mid-IR colors and 24 μm flux densities, provides an effective means for the study of SMGs at z ~ 1.5-2.5.

Item Type:Article
Related URLs:
URLURL TypeDescription
Omont, A.0000-0002-4721-3922
Lonsdale, C. J.0000-0003-0898-406X
Polletta, M.0000-0001-7411-5386
Cox, P.0000-0003-2027-8221
de Breuck, C.0000-0002-6637-3315
Farrah, D.0000-0003-1748-2010
Lagache, G.0000-0003-1492-2519
Menten, K. M.0000-0001-6459-0669
Additional Information:© 2010 American Astronomical Society. Received 2009 December 21; accepted 2010 April 5; published 2010 June 7. The authors are extremely grateful to Tom Phillips for contributing extra observing time when we needed it most. The CSO is funded by the NSF Cooperative Agreement AST- 083826. The Dark Cosmology Centre is funded by the DNRF. T.R.G. acknowledges support from IDA. Facilities: CSO (SHARC-2)
Funding AgencyGrant Number
Danish National Research FoundationUNSPECIFIED
Subject Keywords:high-redshift; galaxies: ISM; galaxies: photometry; galaxies: starburst; infrared: galaxies – submillimeter: galaxies
Issue or Number:1
Classification Code:PACS: 98.54.Ep; 98.58.Bz; 98.62.Py; 98.62.Qz; 98.70.Lt
Record Number:CaltechAUTHORS:20100715-120432455
Persistent URL:
Official Citation:A. Kovács et al 2010 ApJ 717 29 doi: 10.1088/0004-637X/717/1/29
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19081
Deposited By: Jason Perez
Deposited On:19 Jul 2010 17:02
Last Modified:03 Oct 2019 01:51

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