Small scale clumping in the Orion molecular cloud

Details Small scale clumping in the Orion molecular cloud Small scale clumping in the Orion molecular cloud

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98l...4b&link_type=abstract

Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. L4-L7.

Astronomy and Astrophysics

Astrophysics

47

Astronomical Maps, Interstellar Gas, Molecular Clouds, Orion Nebula, Ammonia, Formaldehyde, Gas Density, Optical Thickness

Scientific paper

Results of the high-resolution mapping of the Orion Molecular Cloud in the H2CO and NH3 lines are presented. Observations of the 2(11)-2(12) and 3(12)-3(13) lines of H2CO and the (1,1), (2,2), (3,3), (4,4), and (2,1) lines of NH3 were made at angular resolutions from 1 arcmin to 35 arcsec with the 100-m telescope of the Max-Planck-Institut fuer Radioastronomie, and the (3,3) line of NH3 was observed at a resolution of 2.2 x 1.6 arcmin with the VLA. Two quiescent clouds northeast and south of the Becklin-Neugebauer/Kleinmann-Low (BN/KL) region are found which straddle the contours of hot, vibrationally excited H2, suggesting that the clouds are responsible for directing the expansion of the hot gas. The quiescent clouds themselves are found to have H2 densities greater than or equal to 10 to the 6th/cu cm and masses close to the Jeans masses. Two features originating in the BN/KL feature itself are distinguished: a plateau line of linewidth size greater than or equal to 30 km/sec with two NH3 emission peaks, and a 5.5 km/sec feature (hot core) with kinetic temperature less than 200 K centered on IRc4. It is concluded that the gas represented by the hot core is heated by IRc4, but that IRc4 does not have a primary role in the outflow of complex molecules in this region.

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