U-shaped outflow in the LYNDS 1221 dark cloud - an example of interaction of outflows with ambient molecular clouds

Details U-shaped outflow in the LYNDS 1221 dark cloud - an example of interaction of outflows with ambient molecular clouds U-shaped outflow in the LYNDS 1221 dark cloud - an example of interaction of outflows with ambient molecular clouds

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..510u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 510-518.

Astronomy and Astrophysics

Astrophysics

26

Dark Matter, Gas Dynamics, Interstellar Gas, Molecular Clouds, Star Formation, Angular Resolution, Astronomical Maps, Carbon Monoxide, Interstellar: Molecules, Nebulae: Individyal (Lynds 1221), Nebulae: Internal Motions, Stars: Formation

Scientific paper

We report molecular line observations of the dark cloud L1221 in the J = 1-0 transitions of CO, 13CO, C18O, HCO+, HCN, and CS with angular resolutions of 17"-2'.7. We have discovered a bipolar CO outflow associated with IRAS 22266+6845. The outflow shows a remarkably bent U-shaped structure. The present observations show rather clear evidence for interaction of the outflow with the ambient molecular gas; the ambient gas shows density depression and velocity shift just toward the blue lobe of the outflow. This fact indicates the acceleration and exclusion of the ambient gas by the outflow. The outflow changes its direction in accordance with the dense gas ridge. However, this ridge alone is not likely to be responsible for the outflow morphology, indicating that an external agency to form the outflow morphology is required.

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