Far-Infrared Properties of Spitzer-selected Luminous Starbursts
| Autor: | Kovács, 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. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Astrophys.J.717:29-39,2010 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/717/1/29 |
| Popis: | We present SHARC-2 350 micron data on 20 luminous z ~ 2 starbursts with S(1.2mm) > 2 mJy from the Spitzer-selected samples of Lonsdale et al. and Fiolet et al. All the sources were detected, with S(350um) > 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 6um--2mm measurements of local starbursts. We find characteristic single-component temperatures T1 ~ 35.5+-2.2 K and integrated infrared (IR) luminosities around 10^(12.9+-0.1) Lsun for the SWIRE-selected sources. Molecular gas masses are estimated at 4 x 10^(10) Msun, assuming kappa(850um)=0.15 m^2/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 um flux densities, provides an effective means for the study of SMGs at z ~ 1.5--2.5. Comment: 13 pages, 4 figures, edited to match published version in ApJ 717, 29-39 (2010) |
| Databáze: | arXiv |
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