The evolution of star-bearing molecular clouds - The high-velocity HCO(+) flow in NGC 2071

Details The evolution of star-bearing molecular clouds - The high-velocity HCO(+) flow in NGC 2071 The evolution of star-bearing molecular clouds - The high-velocity HCO(+) flow in NGC 2071

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..633w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 633-649. Research supported by the Naturvetenskapli

Astronomy and Astrophysics

Astrophysics

46

Astronomical Spectroscopy, Molecular Clouds, Stellar Evolution, Collimation, Gas Ionization, Line Spectra, Molecular Flow, Molecular Ions, Spatial Distribution, Velocity Distribution

Scientific paper

Observations of NGC 2071 in the J = 1-0 and J = 3-2 lines of HCO(+) and H(C-13)O(+) obtained with the 11-m NRAO antenna at Kitt Peak and the 20-m mm-wave antenna at Onsala Space Observatory (J = 1-0) and with the 4.9-m antenna at the Millimeter Wave Observatory (J = 3-2) during 1980-1983 are reported and discussed in terms of the mass, momentum, and energy distribution in the bidirectional molecular flow. The results are presented in maps, profiles, diagrams, and tables. The velocity of the bidirectional flow emanating from a core of density 10 to the 6th/cu cm is found to decrease gradually from an initial value of about 35 km/sec, to consist mainly of dense clumps with radii less than 0.01 pc, and to have had a constant momentum-injection rate over the last 10,000 yrs. Little enhancement of HCO(+) abundance or ionization level is detected in the accelerated gas. The value of the higher-transition lines for probing dense-core molecules is indicated, and the formulas used to calculate the flow parameters are derived in an appendix.

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