Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..265j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 265-276.
Astronomy and Astrophysics
Astronomy
27
Carbon Monoxide, Emission Spectra, Infrared Sources (Astronomy), Interstellar Chemistry, Molecular Clouds, Star Formation, Brightness Temperature, Electron Transitions, H Ii Regions, Luminosity, Molecular Spectra, Nebulae
Scientific paper
Upon analyzing the CO 7-6 transition maps obtained toward the luminous star-formation regions W51 and DR 21 in the context of existing information, it emerges that three distinct molecular cloud components contribute to this emission. The first of these is a 100-250 K, dynamically active material accounting for 75 percent of the velocity-integrated CO 7-6 emission from the two sources. The remaining two are a 100-500 K, quiescent material associated with the H II regions in each scource, and a cool, 20-40 K quiescent gas overlying some of the hot material; this cool gas is probably part of the more extended molecular envelope around the luminous cloud core.
Genzel Reinhard
Harris Andrew I.
Jaffe Daniel T.
Lugten John B.
Stacey Gordon J.
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