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SHARC-2 350 μm Observations of Distant Submillimeter-selected Galaxies

Kovács, A. and Chapman, S. C. and Dowell, C. D. and Blain, A. W. and Ivison, R. J. and Smail, I. and Phillips, T. G. (2006) SHARC-2 350 μm Observations of Distant Submillimeter-selected Galaxies. Astrophysical Journal, 650 (2). pp. 592-603. ISSN 0004-637X. doi:10.1086/506341.

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We present 350 μm observations of 15 Chapman et al. submillimeter galaxies (SMGs) with radio counterparts and optical redshifts. We detect 12 and obtain sensitive upper limits for three, providing direct, precise measurements of their far-infrared luminosities and characteristic dust temperatures. With these, we verify the linear radio-far-infrared correlation at redshifts of z ~ 1-3 and luminosities of 10^(11)-10^(13) L_☉, with a power-law index of 1.02 ± 0.12 and rms scatter of 0.12 dex. However, either the correlation constant q or the dust emissivity index β is lower than measured locally. The best-fitting q ≃2.14 is consistent with SMGs being predominantly starbust galaxies, without significant AGN contribution, at far-infrared wavelengths. Gas-to-dust mass ratios are estimated at 54^(+14)_(-11)(κ_(850μm)/0.15 m^2 kg^(-1)), depending on the absoption efficiency κ_ν, with intrinsic dispersion ≃40% around the mean value. Dust temperatures consistent with 34.6 ± 3 K (1.5/β)^(0.71), at z ~ 1.5-3.5, suggest that far-infrared photometric redshifts may be viable, and perhaps accurate to 10% ≲ dz/(1 + z), for up to 80% of the SMG population in this range, if the above temperature characterizes the full range of SMGs. However, observed temperature evolution of T_d ∝ (1 + z) is also plausible and could result from selection effects. From the observed luminosity-temperature (L-T) relation, L ∝ T^(2.82±0.29)_(obs), we derive scaling relations for dust mass versus dust temperature, and we identify expressions to interrelate the observed quantities. These suggest that measurements at a single wavelength, in the far-infrared, submillimeter, or radio wave bands, might constrain dust temperatures and far-infrared luminosities for most SMGs with redshifts at z ~ 0.5-4.

Item Type:Article
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Blain, A. W.0000-0001-7489-5167
Ivison, R. J.0000-0001-5118-1313
Smail, I.0000-0003-3037-257X
Additional Information:© 2006 American Astronomical Society. Received 2006 January 26; accepted 2006 April 27. The authors wish to thank Sophia Khan, Rick Shafer, and Min Yang for their help with collecting data and debugging CRUSH; Jonathan Bird for his contributions to the calibration and observing; Thomas Greve and Harvey Moseley for discussions and helpful insights regarding interpretation; Melanie Leong for her efforts to shorten observing times through improvements to the dish surface; Hiroshige Yoshida for all-around software support at the CSO; and the referee for improving this paper through thoughtful comments. We would further like to express our gratitude for the generous sponsorship of the National Science Foundation in funding this research. Facilities: CSO (SHARC-2)
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Subject Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: ISM; galaxies: photometry; galaxies: starburst; infrared: galaxies; submillimeter
Issue or Number:2
Record Number:CaltechAUTHORS:20110602-110110694
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Official Citation:SHARC-2 350 μm Observations of Distant Submillimeter-selected Galaxies A. Kovács et al. 2006 ApJ 650 592
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23874
Deposited On:07 Jun 2011 19:54
Last Modified:09 Nov 2021 16:18

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