Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..619h&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 15, 1982, p. 619-635. Research supported by the Consejo Nacional de Ciencia y Tec
Astronomy and Astrophysics
Astronomy
63
Mass Transfer, Molecular Spectra, Planetary Nebulae, Radio Sources (Astronomy), Star Formation, Absorption Spectra, Ammonia, Astronomical Maps, Carbon Monoxide, Line Spectra
Scientific paper
The velocity extents, the spatial distributions, and the masses, deduced from CO observations, are very different for the red and blue outflows in Cepheus A. These properties can be modeled by placing the source of outflow amidst an anisotropic density distribution. The red outflow expands in the direction of lower density while the blue outflow encounters greater resistance as it expands toward the density peak in the cloud, as delineated by the NH3 emission. The ratio of the masses and the total mass swept up by the outflow can be estimated by a simple model. The observed self-absorption in the line profile is probably due to absorption by the ambient cloud against a hot and optically thick component in the red outflow. We conclude that the appearance of an outflow is strongly affected by the environment in which it is embedded. In particular, the outflow in Cepheus A may not be very well collimated. The general attributes of the model are shown to be applicable to other regions of outflow. The apparently bipolar nature of outflows in star formation regions is discussed.
Ho Pak Tung
Moran James Michael
Rodriguez Luis F.
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