Observations of 2. mu. m molecular hydrogen emission from NGC 2071, Cepheus A, and GL 961

Journal Article · Tue Jun 15 04:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160017· OSTI ID:6699564

Bally, J; Lane, A P

The infrared emission line at lambda2.12 ..mu..m from the v = 1--0 S(1) transition of molecular hydrogen has been detected and partially mapped in the vicinity of the high-velocity molecular flows associated with NGC 2071, Cepheus A, and GL 961. The H/sub 2/ emission regions are extended on a scale of at least 0.2 to 0.3 pc, comparable to or somewhat greater than the size of the Orion H/sub 2/ source. The H/sub 2/ surface brightness, uncorrected for possible extinction, is, however, at least an order of magnitude lower in NGC 2071, Cep A, and GL 961 than in Orion. For sources with CO emission showing spatial displacement of redshifted and blueshifted peaks, there is a tendency for the strongest H/sub 2/ emission to occur in regions where blueshifted CO wings are the most prominent component. Emission at the positions of redshifted CO wings is weaker or absent. The source GL 490 was mapped over a region subtending several arcminutes and does not exhibit S(1) line emission above a flux level of 1 x 10/sup -20/ W cm/sup -2/.

• Research Organization: Bell Telephone Laboratories, Holmdel, NJ
• OSTI ID: 6699564
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 257:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
EMISSION SPECTRA
HYDROGEN
INFRARED SPECTRA
INTERSTELLAR SPACE
MAPS
MOLECULES
NEBULAE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SPACE
SPECTRA