Far-Infrared Properties of Spitzer-selected Luminous Starbursts - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: We present SHARC-2 350 micron data on 20 luminous z ~ 2 starbursts withS1.2mm > 2 mJy from the Spitzer-selected samples of Lonsdale et al. andFiolet et al. All the sources were detected, with S350um > 25 mJy for 18 ofthem. With the data, we determine precise dust temperatures and luminositiesfor these galaxies using both single-temperature fits and models with power-lawmass-temperature distributions. We derive appropriate formulae to use whenoptical depths are non-negligible. Our models provide an excellent fit to the6um-2mm measurements of local starbursts. We find characteristicsingle-component temperatures T1 ~ 35.5+-2.2 K and integrated infrared IRluminosities around 10^12.9+-0.1 Lsun for the SWIRE-selected sources.Molecular gas masses are estimated at 4 x 10^10 Msun, assumingkappa850um=0.15 m^2-kg and a submillimeter-selected galaxy SMG-likegas-to-dust mass ratio. The best-fit models imply >~2 kpc emission scales. Wealso note a tight correlation between rest-frame 1.4 GHz radio and IRluminosities confirming star formation as the predominant power source. Thefar-IR properties of our sample are indistinguishable from the purelysubmillimeter-selected populations from current surveys. We therefore concludethat our original selection criteria, based on mid-IR colors and 24 um fluxdensities, provides an effective means for the study of SMGs at z ~ 1.5-2.5.



Author: A. Kovács, A. Omont, A. Beelen, C. Lonsdale, M. Polletta, N. Fiolet, T. R. Greve, C. Borys, P. Cox, C. De Breuck, H. Dole, C. D.

Source: https://arxiv.org/







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