Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..846t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. 846-852.
Astronomy and Astrophysics
Astrophysics
9
Accretion Disks, Formaldehyde, Millimeter Waves, Pre-Main Sequence Stars, Stellar Winds, Abundance, Interstellar Matter, Molecular Clouds, Spectrum Analysis, Star Formation
Scientific paper
Maps are presented of the central regions of the molecular bipolar outflows NGC 2071 and L1551 in the J = 3(1, 3)-2(1, 2)-transition of ortho H2CO, which has a rest frequency of 211 GHz. The emission from L1551 was too weak to be fully mapped. Spectra were obtained of the J = 3(1, 2)-2(1, 1) transition of ortho H2CO (225 GHz) at selected positions in NGC 2071. A large velocity gradient (LVG) model was used to determine the H2 density and H2CO abundance in NGC 2071, in an effort to find a structure which could collimate the bipolar outflow. The map indicates the presence of a small dense cloud which seems to be rotating with its axis parallel to the outflow axis; the H2 density inferred from the observations and the LVG model is not sufficiently high for it to collimate the outflow by a static pressure confinement mechanism. However, that collimation by this cloud is still possible over the time scale in which it is disrupted by the wind. It is argued evidence for an overabundance of H2CO in this region has been found.
Goldsmith Paul F.
Snell Ronald L.
Tauber Jan A.
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