Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322l..49h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. L49-L54. Research supported b
Astronomy and Astrophysics
Astrophysics
62
Astronomical Spectroscopy, Gas Heating, Interstellar Gas, Molecular Clouds, Molecular Gases, Ultraviolet Radiation, Carbon Monoxide, Line Spectra, Photoelectric Effect
Scientific paper
The authors report measurements of 372 μm J = 7→6 and 186 μm J = 14→13 CO line emission toward the interface between the molecular cloud and the H II region in M17, and toward the center of the bipolar nebula S106. The ratio of 14→13/7→6 lines indicates gas temperatures between 200 and 500 K, and hydrogen densities ≥104cm-3. The 7→6 lines are remarkably narrow, with widths of ≡5 - 10 km s-1, identical to those of the cool quiescent molecular cloud cores. The warm quiescent molecular gas is in the interface between the exciting OB stars and the surrounding molecular cloud. Possible heating mechanisms of the warm CO gas are slow shocks and heating by photoelectrons in UV-illuminated, photodissociation regions.
Genzel Reinhard
Harris Andrew I.
Jaffe Daniel T.
Lugten John B.
Stacey Gordon J.
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