Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rmxaa..18...55j&link_type=abstract
(Universidad Nacional Autonoma de Mexico and CONACYT, Conferencia Mexicana-Texana de Astrofisica, 2nd, Mexico City, MX, Feb. 22-
Astronomy and Astrophysics
Astronomy
4
Interstellar Chemistry, Interstellar Gas, Molecular Clouds, Photodissociation, Ultraviolet Astronomy, Fine Structure, Gas Density, Gas Ionization, Molecular Gases
Scientific paper
Dense gas at the ionized/neutral boundaries of molecular clouds illuminated by far-UV photons plays an important role in the appearance of the neutral interstellar medium. It also is a laboratory for the study of UV-photochemistry and of a number of heating and cooling phenomena not seen elsewhere. Fine structure lines of neutral and low ionization potential species dominate the cooling in the outer part of the photodissociation regions. Observations of these lines show that the regions are dense and highly clumped. Observations of H2 and CO show that heating by UV photons plays a significant role in the excitation of molecular lines near the H II/neutral boundary. Warm CO is more abundant in these regions than predicted by the standard theoretical models. Optical reflection nebulas provide an ideal laboratory for the study of photodissocciation region phenomena.
Howe John Edward Jr.
Jaffe Daniel T.
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