Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..93e&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 15, 1979, p. L93-L96.
Astronomy and Astrophysics
Astrophysics
21
B Stars, Compressed Gas, Shock Waves, Star Formation, Water Masers, Carbon Monoxide, H Ii Regions, Line Spectra, Propagation Velocity, Radio Emission
Scientific paper
Evidence for the cooled postshock layer situated between the expanding H II region NGC 281 and an adjacent molecular cloud is shown by a well-sampled map of (C-12)O and (C-13)O line profiles having 0.16-km/s resolution. The shocked region shows a higher (C-12)O temperature and column density than the unshocked cloud, and the shock velocity is 1.5 to 2 km/s, depending on position. An H2O maser located at the site of peak shock activity was observed at three epochs separated by 4.5 and 10 months, respectively. The H2O line velocities and strengths show considerable variation, but the strongest emission line is always within + or - 1 km/s of the neutral cloud velocities. It is suggested that the associated maser source is a middle- to late-type B star that was formed in the shock-compressed gas.
Elmegreen Bruce G.
Moran James Michael
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