CO(J = 4-3) map of OMC 1

Details CO(J = 4-3) map of OMC 1 CO(J = 4-3) map of OMC 1

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..629s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 629-636.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Maps, Carbon Monoxide, Interstellar Matter, Line Spectra, Molecular Clouds, H Ii Regions, Star Formation

Scientific paper

A map of CO(4-3) emission toward OMC1 is presented with 75 arcsec angular resolution. The distinct features of the region, namely the Main Ridge, the Eastern Bay and the Southern Bar, are investigated. While for the northern three clumps in the Main Ridge (S3, S4, KL) the CO(4-3) emission is in accordance with lower-J CO line results, the southern clump, S6, is brighter; this is interpreted as due to a thin hot envelope. In the Eastern Bay adjacent to the Trapezium, and even more clearly at the ionization front near the Southern Bar, destruction of molecules takes place, presumably by photodissociation. We discuss the optical depth of different velocity ranges in the outflow spectra of IRc2 and S6 in comparison with other CO data; for IRc2 we find evidence for a clumpy structure of the outflowing gas; the excitation temperature of the outflowing gas in both sources is found to lie in the range 200-300 K.

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