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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 559292.0, MPI für Astronomie / Publikationen_mpia
Far-infrared properties of Spitzer-selected luminous starbursts
Authors:Kovač, A.; Omont, A.; Beelen, A.; Lonsdale, C.; Polletta, M.; Fiolet, N.; Greve, T. R.; Borys, C.; Cox, P.; De Breuck, C.; Dole, H.; Dowell, C. D.; Farrah, D.; Lagache, G.; Menten, K. M.; Bell, T. A.; Owen, F.
Language:English
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Volume:717
Issue / Number:1
Start Page:29
End Page:39
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 1012.9 ± 0.1 L sun for the SWIRE-selected sources. Molecular gas masses are estimated at sime4 × 1010 M sun, assuming κ850 μm = 0.15 m2 kg–1 and a submillimeter-selected galaxy (SMG)-like gas-to-dust mass ratio. The best-fit models imply gsim2 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.
Free Keywords:galaxies: high-redshift; galaxies: ISM; galaxies: photometry; galaxies: starburst; infrared: galaxies; submillimeter: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...717...29K [ID No:1]
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