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Green Bank Telescope Zpectrometer CO(1-0) observations of the strongly lensed submillimeter galaxies from the Herschel ATLAS

Frayer, D. T.; Harris, A. I.; Baker, A. J.; Ivison, R. J.; Smail, Ian; Negrello, M.; Maddalena, R.; Aretxaga, I.; Baes, M.; Birkinshaw, M.; Bonfield, D. G.; Burgarella, D.; Buttiglione, S.; Cava, A.; Clements, D. L.; Cooray, A.; Dannerbauer, H.; Dariush, A.; De Zotti, G.; Dunlop, J. S.; Dunne, L.; Dye, S.; Eales, S.; Fritz, J.; Gonzalez-Nuevo, J.; Herranz, D.; Hopwood, R.; Hughes, D. H.; Ibar, E.; Jarvis, M. J.; Lagache, G.; Leeuw, L. L.; Lopez-Caniego, M.; Maddox, S.; Michałowski, M. J.; Omont, A.; Pohlen, M.; Rigby, E.; Rodighiero, G.; Scott, D.; Serjeant, S.; Smith, D. J. B.; Swinbank, A. M.; Temi, P.; Thompson, M. A.; Valtchanov, I.; van der Werf, P. P. and Verma, A. (2010). Green Bank Telescope Zpectrometer CO(1-0) observations of the strongly lensed submillimeter galaxies from the Herschel ATLAS. The Astrophysical Journal, 726(2) L22.

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The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) has uncovered a population of strongly-lensed submillimeter galaxies (SMGs). The Zpectrometer instrument on the Green Bank Telescope (GBT) was used to measure the redshifts and constrain the masses of the cold molecular gas reservoirs for two candidate high-redshift lensed sources. We derive CO(1-0) redshifts of z=3.042+/-0.001 and z=2.625+/-0.001, and measure molecular gas masses of $(1-3)x10^{10}\emph{M}\odot$, corrected for lens amplification and assuming a conversion factor of ${\alpha}=0.8\odot(K km s^{-1} pc^{2})^{-1}$. We find typical L(IR)/L'(CO) ratios of 120±40 and 140±50 $\emph{L}\odot (K km s^{-1} pc^{2})^{-1}$, which are consistent with those found for local ULIRGs and other high-redshift SMGs. From analysis of published data, we find no evidence for enhanced L(IR)/L'(CO(1-0)) ratios for the SMG population in comparison to local ULIRGs. The GBT results highlight the power of using the CO lines to derive blind redshifts, which is challenging for the SMG population at optical wavelengths given their high obscuration.

Item Type: Journal Article
Copyright Holders: 2010 IOP Publishing
ISSN: 1538-4357
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 26076
Depositing User: Colin Smith
Date Deposited: 07 Jan 2011 16:19
Last Modified: 15 Jan 2016 16:40
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