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The (C2) 158 micrometer emission from the Horsehead nebulaThe C II 158 micrometer line and the several rotational lines of CO, CO-13, and CS toward selected positions in the Horsehead extinction region in IC 434 are mapped. The observations show that the region has a gas density of about 10,000 cu cm and an external UV (Ultraviolet) flux to 20 to 100 times the average interstellar UV field. Although this is a regime where the C+ emission varies rapidly with UV intensity, fine structure line emission from gas with this range of physical conditions were not investigated previously. Comparisons of results with models of photodissociation regions show that existing plane parallel photodissociation region models are in general agreement with the observed intensity. It is not necessary to invoke a clumpy structure in the boundary layer to explain the observations, but the overall geometry of the cloud is important in determining the distribution of C+ emission.
Document ID
19950019333
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Zhou, S.
(Texas Univ. Austin, TX., United States)
Jaffe, D. T.
(Texas Univ. Austin, TX., United States)
Howe, J. E.
(Texas Univ. Austin, TX., United States)
Geis, N.
(California Univ. Berkeley, CA., United States)
Herrmann, F.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Madden, S. C.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Poglitsch, A.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Stacey, G. J.
(California Univ. Berkeley, CA., United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-197797
MPE-PREPRINT-262
NAS 1.26:197797
Accession Number
95N25753
Funding Number(s)
CONTRACT_GRANT: NSF AST-90-17710
CONTRACT_GRANT: NASA-POS-46462-E
CONTRACT_GRANT: NAG2-402
CONTRACT_GRANT: NSF AST-90-24603
Distribution Limits
Public
Copyright
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