HERSCHEL SEARCH FOR O{sub 2} TOWARD THE ORION BAR

We report the results of a search for molecular oxygen (O{sub 2}) toward the Orion Bar, a prominent photodissociation region at the southern edge of the H II region created by the luminous Trapezium stars. We observed the spectral region around the frequency of the O{sub 2} N{sub J} = 3{sub 3}-1{sub...

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Bibliographic Details
Published in:The Astrophysical journal 2012-06, Vol.752 (1)
Main Authors: Melnick, Gary J., Tolls, Volker, Goldsmith, Paul F., Kaufman, Michael J., Hollenbach, David J., Black, John H., Hjalmarson, Ake, Liseau, Rene, Encrenaz, Pierre, Pagani, Laurent, Falgarone, Edith, Gerin, Maryvonne, Li, Di, Lis, Dariusz C., Neufeld, David A., Snell, Ronald L., Van der Tak, Floris, Van Dishoeck, Ewine F.
Format: Article
Language:English
Subjects:
ABUNDANCE
ADSORPTION
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ATOMS
COSMOCHEMISTRY
DENSITY
DISSOCIATION
EMISSION
FAR INFRARED RADIATION
FAR ULTRAVIOLET RADIATION
GHZ RANGE
HYDROGEN
MOLECULES
OXYGEN
PHOTOLYSIS
STARS
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Summary:We report the results of a search for molecular oxygen (O{sub 2}) toward the Orion Bar, a prominent photodissociation region at the southern edge of the H II region created by the luminous Trapezium stars. We observed the spectral region around the frequency of the O{sub 2} N{sub J} = 3{sub 3}-1{sub 2} transition at 487 GHz and the 5{sub 4}-3{sub 4} transition at 774 GHz using the Heterodyne Instrument for the Far-Infrared on the Herschel Space Observatory. Neither line was detected, but the 3{sigma} upper limits established here translate to a total line-of-sight O{sub 2} column density
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/752/1/26