Submillimeter observations of NGC 2024, OMC-2, and MON R-2

Details Submillimeter observations of NGC 2024, OMC-2, and MON R-2 Submillimeter observations of NGC 2024, OMC-2, and MON R-2

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..100h&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 100-103, 105-108.

Astronomy and Astrophysics

Astronomy

41

Interstellar Matter, Radio Astronomy, Radio Sources (Astronomy), Submillimeter Waves, Astronomical Maps, Far Infrared Radiation, Hydrocyanic Acid, Optical Density, Radiant Flux Density, Radio Emission

Scientific paper

The paper reports submillimeter (effective wavelength about 400 microns) observations of three dense molecular clouds: NGC 2024 (Orion B), OMC-2 (in Orion A), and Mon R-2. These objects strongly resemble the far-infrared source in the Kleinmann-Low nebula in Orion A. An extensive map of NGC 2024 shows the peak of submillimeter brightness to coincide with the peak locations of far-infrared continuum and HCN molecular-line emissions. The submillimeter and far-infrared brightness distributions differ in spatial detail, suggesting that the submillimeter emission comes from a cool region with temperature of about 25 K (inferred from the surface brightness of the optically thick (C-12)(O-16) line). Arguments based on the column density derived from optically thin molecular lines yield an effective mass-absorption coefficient of 17 sq cm/g for the continuum opacity at 400 microns; however, this estimate is subject to large uncertainties. It is suggested that the star 2024 No. 2 is imbedded in the molecular cloud and supplies the energy of the submillimeter emission.

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