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350 μm Observations of Ultraluminous Infrared Galaxies at Intermediate Redshifts

Yang, M. and Greve, T. R. and Dowell, C. D. and Borys, C. (2007) 350 μm Observations of Ultraluminous Infrared Galaxies at Intermediate Redshifts. Astrophysical Journal, 660 (2). pp. 1198-1208. ISSN 0004-637X. doi:10.1086/514809.

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We present 350 μm observations of 36 ultraluminous infrared galaxies (ULIRGs) at intermediate redshifts (0.089 ≤ z ≤ 0.926) using the Submillimeter High Angular Resolution Camera II (SHARC-II) on the Caltech Submillimeter Observatory (CSO). In total, 28 sources are detected at S/N ≥ 3, providing the first flux measurements longward of 100 μm for a statistically significant sample of ULIRGs in the redshift range 0.1 ≲ z ≲ 1.0. Combining our 350 μm flux measurements with the existing IRAS 60 and 100 μm data, we fit a single-temperature model to the spectral energy distribution (SED) and thereby estimate dust temperatures and far-IR luminosities. Assuming an emissivity index of β = 1.5, we find a median dust temperature and far-IR luminosity of T_d = 42.8 ± 7.1 K and log(L_(FIR)/L_☉) = 12.2 ± 0.5, respectively. The far-IR-radio correlation observed in local star-forming galaxies is found to hold for ULIRGs in the redshift range 0.1 ≲ z ≲ 0.5, suggesting that the dust in these sources is predominantly heated by starbursts. We compare the far-IR luminosities and dust temperatures derived for dusty galaxy samples at low and high redshifts with our sample of ULIRGs at intermediate redshift. A general L_(FIR)-T_d relation is observed, albeit with significant scatter due to differing selection effects and variations in dust mass and grain properties. The relatively high dust temperatures observed for our sample compared to that of high-z submillimeter-selected starbursts with similar far-IR luminosities suggest that the dominant star formation in ULIRGs at moderate redshifts takes place on smaller spatial scales than is found at higher redshifts.

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Additional Information:© 2007 American Astronomical Society. Print publication: Issue 2 (2007 May 10); received 2006 November 17; accepted for publication 2007 February 12. We thank Attila Kova´cs for help with data reduction and taking data on our behalf; Andrew Blain for useful discussions and providing part of the LFIR-Td data; and Philip Best for providing us with AGN/starburst classifications for some of our sources. We are deeply grateful to the referee for insightful and thorough comments. The CSO is supported by the NSF fund under contract AST 02-29008.
Funding AgencyGrant Number
NSFAST 02-29008
Subject Keywords:galaxies: starburst; infrared: galaxies; infrared: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20091117-094743812
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Official Citation:350 μm Observations of Ultraluminous Infrared Galaxies at Intermediate Redshifts M. Yang, T. R. Greve, C. D. Dowell, and C. Borys 2007 ApJ 660 1198-1208 doi: 10.1086/514809
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16724
Deposited By: Jason Perez
Deposited On:17 Nov 2009 23:46
Last Modified:08 Nov 2021 23:29

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