Orion B (NGC 2024). II - Hat Creek synthesis observations of the molecular core in the J = 1 to 0 line of HCO(+)

Details Orion B (NGC 2024). II - Hat Creek synthesis observations of the molecular core in the J = 1 to 0 line of HCO(+) Orion B (NGC 2024). II - Hat Creek synthesis observations of the molecular core in the J = 1 to 0 line of HCO(+)

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..176b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 176-188. Research supported by the University of Ill

Astronomy and Astrophysics

Astronomy

21

Molecular Clouds, Orion Nebula, Emission Spectra, Infrared Sources (Astronomy), Molecular Gases, Spatial Resolution, Velocity Distribution

Scientific paper

Aperture synthesis maps of HCO(+) J = 1 to 0 emission at 89 GHz for the molecular cloud Orion B were obtained with the Hat Creek Array. The spatial resolution is 11 x 8 arcsec and the velocity resolution is 0.53 km/s. The maps show much fine structure in the dense molecular core, including a centrally located broad-line region with an elliptical velocity distribution and apparently centered on the FIR source FIR 6, a long-quiescent, NS-oriented ridge at a PA of -10 deg with a similar appearance to the cold dust emission, an EW ridge exactly abuts the ioniztaion front of the adjacent H II region, and a possible one-sided high-density outflow to the south with an region apparently not near any of the NIR sources but instead close to FIR 5. FIR 5 and 6 therefore seem to indicate two different centers of activity in the molecular core.

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