Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..558b&link_type=abstract
Astrophysical Journal, Part 1, vol. 261, Oct. 15, 1982, p. 558-568.
Astronomy and Astrophysics
Astronomy
96
Carbon Monoxide, Gas Flow, Infrared Astronomy, Molecular Clouds, Planetary Nebulae, Astronomical Maps, Emission Spectra, Kinematics, Line Spectra, Rotating Disks
Scientific paper
The discovery of an extended, high-velocity molecular outflow associated with the IR sources in NGC 2071 is reported. High-velocity CO emission from this star-forming molecular cloud core can be traced over a region 4 arcmin in diameter and detected over a velocity range of 70 km/sec. The flow is bipolar; the blueshifted CO emission is displaced to the northeast, while the redshifted emission is displaced to the southwest. Observations in the 98 GHz transition of CS reveal a ridge of dense gas oriented orthogonal to the high-velocity flow axis. A systematic velocity gradient seen in the CS line core suggests that the ridge is a dense, rotating disk centered on the IR source. The disk may be responsible for collimating a spherically symmetric wind originating near the IR source into the bipolar flow observed in the high-velocity CO line wings. The high-velocity CO line wings are modeled as beam diluted emission from clumps or filaments with C-12O optical depths close to unity and a small filling factor. The clumps may be either objects ejected from the vicinity of the central infrared source or shocked gas at the front where a higher velocity but invisible flow encounters ambient cloud material.
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