Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..650c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 650-663.
Astronomy and Astrophysics
Astronomy
56
Infrared Astronomy, Interstellar Matter, Molecular Clouds, Radio Sources (Astronomy), Star Formation, H Ii Regions, Millimeter Waves, Nebulae
Scientific paper
CO millimeter-wave observations of the star-formation region NGC 7538 centered in the region around IRS 1-3 are presented, and a large (r = about 1.3 pc) and massive (75-solar-mass) high-velocity molecular outflow is identified. The correspondence of far-infrared emission with the extent of the molecular outflow leads to the proposal of an in situ mechanism for radiative acceleration of the gas, operable in cases where tau (dust) is insufficient to permit the snowplow outflow effect. New and previously published near-infrared emission-line observations of IRS 1-3 are synthesized, and an apparent deficit in ionizing flux relative to the total far-infrared luminosity is found. IRS 1 is identified as the most luminous of the three sources, in which dust absorption within the ultracompact H II region has sharply reduced the ionizing flux. On this basis it is argued that IRS 1 may also be the primary if not sole cause of the molecular outflow.
Campbell Bel
Thompson Rodger I.
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