Astrophys. J., 717, 29-39 (2010/July-1)
Far-infrared properties of Spitzer-selected luminous starbursts.
KOVACS 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. and OWEN F.
Abstract (from CDS):
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 T1=~ 35.5±2.2 K and integrated infrared (IR) luminosities around 1012.9±0.1 L☉ for the SWIRE-selected sources. Molecular gas masses are estimated at =~4x1010 M☉, assuming κ_850 µm_= 0.15 m2/kg 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.
galaxies: high-redshift - galaxies: ISM - galaxies: photometry - galaxies: starburst - infrared: galaxies - submillimeter: galaxies
Table 4: [KOB2010] A (Nos A-D).
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