Indriolo, Nick ORCID: 0000-0001-8533-6440, Bergin, E. A., Goicoechea, J. R., Cernicharo, J., Gerin, M., Gusdorf, A., Lis, D. C. and Schilke, P. (2017). CO Spectral Line Energy Distributions in Galactic Sources: Empirical Interpretation of Extragalactic Observations. Astrophys. J., 836 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

The relative populations in rotational transitions of CO can be useful for inferring gas conditions and excitation mechanisms at work in the interstellar medium. We present CO emission lines from rotational transitions observed with Herschel/HIFI in the star-forming cores Orion. S, Orion. KL, Sgr. B2(M), and W49N. Integrated line fluxes from these observations are combined with those from Herschel/PACS observations of the same sources to construct CO spectral line energy distributions (SLEDs) from 5 <= J(u) <= 48. These CO SLEDs are compared to those reported in other galaxies, with the intention of empirically determining which mechanisms dominate excitation in such systems. We find that CO SLEDs in Galactic star-forming cores cannot be used to reproduce those observed in other galaxies, although the discrepancies arise primarily as a result of beam filling factors. The much larger regions sampled by the Herschel beams at distances of several megaparsecs contain significant amounts of cooler gas, which dominate the extragalactic CO SLEDs, in contrast to observations of Galactic starforming regions, which are focused specifically on cores containing primarily hot molecular gas.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Indriolo, NickUNSPECIFIEDorcid.org/0000-0001-8533-6440UNSPECIFIED
Bergin, E. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gusdorf, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-239866
DOI: 10.3847/1538-4357/836/1/117
Journal or Publication Title: Astrophys. J.
Volume: 836
Number: 1
Date: 2017
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
STAR-FORMING REGIONS; EXTRAORDINARY SOURCES ANALYSIS; MOLECULAR GAS; HERSCHEL OBSERVATIONS; NGC 1068; ORION SOUTH; EMISSION; GALAXIES; OUTFLOW; OMC-1Multiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/23986

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