H I aperture synthesis observations towards galactic H II regions and molecular clouds. I - NGC 7538 and S 159

Details H I aperture synthesis observations towards galactic H II regions and molecular clouds. I - NGC 7538 and S 159 H I aperture synthesis observations towards galactic H II regions and molecular clouds. I - NGC 7538 and S 159

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192...11r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, July 1980, p. 11-32.

Astronomy and Astrophysics

Astronomy

33

Astronomical Spectroscopy, H Ii Regions, Image Processing, Molecular Spectra, Nebulae, Ocean Surface, Radio Astronomy, Sea States, Synthetic Apertures, Absorption Spectra, Abundance, Astronomical Maps, Astronomical Models, Emission Spectra, Stellar Envelopes

Scientific paper

The paper presents aperture synthesis observations at lambda 21 cm of H I emission and absorption towards the H II region/molecular cloud complex containing NGC 7538 and S 159. Bright H I emission is associated with both NGC 7538 and S 159; H I absorption mapped across NGC 7538 combined with the emission observations shows evidence for a shocked neutral shell. The shell expands at the rate of 10 km/s around the H II region, presumably related to the ionization front. These features are consistent with a modified form of the 'blister' model for H II regions, in which the 'Stromgren sphere' is highly elongated towards the low-density edge of the parent molecular cloud. This elongation is probably caused by the more rapid expansion of ionization fronts into regions of lower density. Strong absorption features are related to the compact H II regions; they may represent H2 gas dissociated by ultraviolet radiation from the exciting stars.

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