Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..525s&link_type=abstract
Astrophysical Journal, Part 1, vol. 220, Mar. 1, 1978, p. 525-537.
Astronomy and Astrophysics
Astronomy
99
Gas Cooling, Infrared Astronomy, Interstellar Gas, Molecular Interactions, Shock Waves, Gas Dissociation, H Ii Regions, Solar Wind Velocity, Stellar Evolution, Stellar Luminosity
Scientific paper
Models are presented of interstellar shocks in molecular clouds over ranges of ambient molecular density from 1000 to 10 million per cu cm and shock velocity from 6 to 14 km/s. Estimates of H2-H2 collisional-excitation rates are used to derive the H2 radiative cooling rates from vibrational-rotational quadrupole transitions as a function of n(H2) and temperature. The emissivities integrated through the shock of the strongest infrared lines in the v = 1-0, 2-0, and 2-1 bands of H2. The effectiveness of H2 dissociative cooling is considered for the highest-velocity shocks. The H2 line intensities from such shocks are compared with those produced by the 'competitive' mechanism of UV pumping for two likely driving mechanisms of shocks - wind-driven shells and expanding H II regions.
Hollenbach David J.
Shull Michael J.
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