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Title:
Detection of the 13CO J=6-->5 transition in the Starburst Galaxy NGC 253
Authors:
Hailey-Dunsheath, S.; Nikola, T.; Stacey, G. J.; Oberst, T. E.; Parshley, S. C.; Bradford, C. M.; Ade, P. A. R.; Tucker, C. E.
Affiliation:
AA(Department of Astronomy, Cornell University, Ithaca, NY 14853; .), AB(Department of Astronomy, Cornell University, Ithaca, NY 14853; .), AC(Department of Astronomy, Cornell University, Ithaca, NY 14853; .), AD(Department of Astronomy, Cornell University, Ithaca, NY 14853; .; Current Address: Westminster College, Department of Physics, 319 South Market Street, New Wilmington, PA 16172.), AE(Department of Astronomy, Cornell University, Ithaca, NY 14853; .), AF(Jet Propulsion Laboratory, Pasadena, CA 91109.), AG(Department of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK.), AH(Department of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK.)
Publication:
The Astrophysical Journal, Volume 689, Issue 2, pp. L109-L112. (ApJL Homepage)
Publication Date:
12/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Individual: NGC Number: NGC 253, Galaxies: ISM, Galaxies: Nuclei, Galaxies: Starburst, ISM: Molecules, Submillimeter
DOI:
10.1086/595840
Bibliographic Code:
2008ApJ...689L.109H

Abstract

We report the detection of 13CO J=6-->5 emission from the nucleus of the starburst galaxy NGC 253 with the redshift (z) and Early Universe Spectrometer (ZEUS), a new submillimeter grating spectrometer. This is the first extragalactic detection of the 13CO J=6-->5 transition, which traces warm, dense molecular gas. We employ a multiline LVG analysis and find ~35%-60% of the molecular interstellar medium is both warm (T~110 K) and dense (nH2~104 cm-3). We analyze the potential heat sources and conclude that ultraviolet and X-ray photons are unlikely to be energetically important. Instead, the molecular gas is most likely heated by an elevated density of cosmic rays or by the decay of supersonic turbulence through shocks. If the cosmic rays and turbulence are created by stellar feedback within the starburst, then our analysis suggests the starburst may be self-limiting.
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