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Title:
Beneath the Baselines: Detecting Molecular Emission from Submillimeter Galaxies with the GBT
Authors:
Hainline, L. J.; Blain, A.; Greve, T.; Chapman, S.; Smail, I.; Ivison, R. J.
Publication:
From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies ASP Conference Series, Vol. 375, proceedings of the conference held 12-14 January, 2006 at the North American ALMA Science Center, National Radio Astronomy Observatory, Charlottesville, Virginia, United States. Edited by Andrew J. Baker, Jason Glenn, Andrew I. Harris, Jeffrey G. Mangum and Min S. Yun., p.157
Publication Date:
10/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..375..157H

Abstract

We report the first detection of a submillimeter galaxy (SMG) in CO(1→0) emission using the GBT. We identify a line with Δ vFWHM ˜ 1000 km s-1 in the 1 cm spectrum of SMM~J13120+4242 at z=3.408, which is significantly greater than the width of the previously detected CO(4→3) line. If the observed CO(1→0) line profile arises from a single object and not several merging objects, the CO(4→3)/CO(1→0) brightness temperature ratio of ˜ 0.26 suggests n(H2) > 103 cm-3 and the presence of sub-thermally excited gas. The 10σ integrated line flux implies a cold molecular gas mass M(H2) ˜ 1011 Msun, comparable to the dynamical mass estimate and four times larger than the H2 mass found from the CO(4→3) line. While our observations confirm that this SMG is massive and highly gas-rich, they also suggest that Jupper>3 transitions of CO may not accurately trace cold, diffuse molecular gas in SMGs.
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