Statistics – Computation
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..349k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 349-357.
Statistics
Computation
19
Ammonia, H Ii Regions, Ionized Gases, Molecular Clouds, Shock Fronts, Star Formation, Computational Astrophysics, Gravitational Effects, Interstellar Gas, Stellar Mass
Scientific paper
We report on 5" resolution observations of the molecular gas around the ultracompact H II regions W33- main in the (J, K) = (1, 1) inversion transition of NH3. Velocity gradients, increased optical depth, and brightened NH3 emission from the gas immediately surrounding the newly formed H II regions suggest compression and heating of the molecular gas similar to what should be found in ionization-shock fronts at the H II region boundaries. Anticorrelated line brightness and optical depth variations along the ionization-shock fronts further suggest the formation of knots of dense gas within the postshock layer either by development of inherent instabilities or the enhancement of pre-existing inhomogeneities.
Ho Pak Tung
Keto Eric R.
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