Energetic activity in a star-forming molecular cloud core; a disk constrained bipolar outflow in NGC 2071

Journal Article · Fri Oct 15 04:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160366· OSTI ID:6524542

Bally, J

The discovery of an extended, high-velocity molecular outflow associated with the infrared sources in NGC 2071 is reported. High-velocity CO emission from this star-forming molecular cloud core can be traced over a region 4' in diameter and detected over a velocity range of 70 km s/sup -1/. 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 /sup 12/ CO 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.

• Research Organization: Bell Laboratories, Crawford Hill Laboratory
• OSTI ID: 6524542
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 261:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBON SULFIDES
CHALCOGENIDES
COSMIC GASES
COSMIC RADIO SOURCES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
FLUIDS
GASES
H2 REGIONS
INFRARED RADIATION
INFRARED SPECTRA
NEBULAE
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SPATIAL DISTRIBUTION
SPECTRA
SULFIDES
SULFUR COMPOUNDS