FAR-INFRARED PROPERTIES OF SPITZER-SELECTED LUMINOUS STARBURSTS

Journal Article · Thu Jul 01 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/717/1/29· OSTI ID:21452895

Kovacs, A ^[1]; Omont, A; Fiolet, N ^[2]; Beelen, A; Dole, H; Lagache, G ^[3]; Lonsdale, C ^[4]; Polletta, M ^[5]; Greve, T R ^[6]; Borys, C; Dowell, C D; Bell, T A ^[7]; Cox, P ^[8]; De Breuck, C ^[9]; Farrah, D ^[10]; Menten, K M ^[11]; Owen, F ^[12]

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1. University of Minnesota, 116 Church St SE, Minneapolis, MN 55414 (United States)
2. UPMC Univ Paris 06, UMR7095, Institut d'Astrophysique de Paris, F-75014 Paris (France)
3. Institut d'Astrophysique Spatiale, bat 121, Universite Paris Sud 11 and CNRS (UMR8617), 91405 Orsay Cedex (France)
4. Infrared Processing and Analysis Center, California Institute of Technology, 100-22 Pasadena, CA 91125 (United States)
5. Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424 (United States)
6. Max-Planck-Institut fuer Astronomie, 69117 Heidelberg (Germany)
7. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
8. Institut de Radioastronomie Millimetrique, 200 rue de la Piscine, 380406 St. Martin d'Heres (France)
9. European Southern Observatory, Karl-Schwarzschild Strasse, 85748 Garching bei Muenchen (Germany)
10. Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9RH (United Kingdom)
11. Max-Plank-Institut fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn (Germany)
12. National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801 (United States)

We present SHARC-2 350 {mu}m data on 20 luminous z {approx} 2 starbursts with S{sub 1.2{sub mm}} > 2 mJy from the Spitzer-selected samples of Lonsdale et al. and Fiolet et al. All the sources were detected, with S{sub 350{sub {mu}m}} > 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 {mu}m-2 mm measurements of local starbursts. We find characteristic single-component temperatures T{sub 1} {approx_equal} 35.5 {+-} 2.2 K and integrated infrared (IR) luminosities around 10{sup 12.9{+-}0.1} L{sub sun} for the SWIRE-selected sources. Molecular gas masses are estimated at {approx_equal}4 x 10{sup 10} M{sub sun}, assuming {kappa}{sub 850{sub {mu}m}} = 0.15 m{sup 2} kg{sup -1} and a submillimeter-selected galaxy (SMG)-like gas-to-dust mass ratio. The best-fit models imply {approx_gt}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 {mu}m flux densities, provides an effective means for the study of SMGs at z {approx} 1.5-2.5.

• OSTI ID: 21452895
• Journal Information: Astrophysical Journal, Vol. 717, Issue 1; Other Information: DOI: 10.1088/0004-637X/717/1/29; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
FLUX DENSITY
GALACTIC EVOLUTION
GALAXIES
LUMINOSITY
MASS
PHOTOMETRY
RED SHIFT
STARS
TEMPERATURE DISTRIBUTION
EVOLUTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES