Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..371r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 371-386.
Astronomy and Astrophysics
Astronomy
19
Centimeter Waves, H Ii Regions, Hydrogen Atoms, Hydrogen Ions, Molecular Clouds, Radio Astronomy, Radio Emission, Velocity Distribution, Astronomical Photography, Continuous Spectra, Infrared Photography, Nebulae, Photodissociation, Photomapping, Radiation Absorption, Radio Telescopes, Shock Fronts
Scientific paper
Aperture synthesis observations of 21-cm H I emission and absorption towards the H II region/molecular cloud complex W58 are presented, the angular resolution being 2.5 x 4.6 arcmin (RA x Dec), and the velocity resolution 2 km/sec. A large cloud, visible in emission, is found centered immediately to the north of K3-50. The velocity structure of the cloud is very complex and is not consistent with simple rotation; instead it suggests large-scale expanding shells or sheets of gas moving at relative velocities of approximately 10-20 km/sec. It is noted that a large-scale expansion may account in part for the velocity and distance anomaly to W58 and may also be responsible for triggering the recent waves of star formation in this complex. H I absorption towards the compact H II regions is found to be consistent with the production of atomic hydrogen close to the H II regions themselves by photo-dissociation of H2.
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