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Observations of CO J = 1–0 near z = 2.5: constraints on the ISM of high-redshift galaxies

Published online by Cambridge University Press:  25 November 2011

M. Röllig ,
R. Simon ,
V. Ossenkopf ,
J. Stutzki ,
A.I. Harris  and
A.J. Baker
A.I. Harris
Affiliation:
Department of Astronomy, University of Maryland, College Park, MD 20742, USA
A.J. Baker
Affiliation:
Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd., Piscataway, NJ 08854, USA
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Abstract

We discuss observations of the CO J =  1–0 line from massive galaxies in the early Universe. In the submillimeter galaxies (SMGs) we have observed, the CO line intensity ratios rule out low-J emission dominated by subthermally excited gas. This implies that an interpretation of subthermally excited gas from the 2–1/1–0 line ratio, the basis for the mass density conversion factor derived for ULIRGs in the local universe, is unlikely to apply to SMGs. Our observations can be more physically explained by interstellar media with different filling factors for different gas components.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 52: Conditions and Impact of Star Formation , 2011 , pp. 67 - 70
Copyright
© EAS, EDP Sciences 2011

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