VLA observations of 43-GHz continuum and CS J=1-0 emission from Orion-IRc2 and the hot core

Details VLA observations of 43-GHz continuum and CS J=1-0 emission from Orion-IRc2 and the hot core VLA observations of 43-GHz continuum and CS J=1-0 emission from Orion-IRc2 and the hot core

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..445c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 2, pp. 445-454.

Astronomy and Astrophysics

Astronomy

13

Ism: Abundances, H Ii Regions, Ism: Individual: Orion-Irc2, Ism: Molecules, Radio Continuum: Ism, Radio Lines: Ism

Scientific paper

We have used the VLA to image at 2-arcsec resolution the Orion-IRc2 region in 43-GHz continuum and CS(1-0) emission. In the continuum, radio sources I and B are detected together with an extended emission component which peaks at source I. Comparison of this extended component with lower frequency data suggests that it is free-free emission from a dusty H ii region ionized by source I. The compact CS(1-0) emission originates from the hot core, the compact ridge and the western clump. The hot core component has a line brightness temperature of ~150K, and is optically thick. We derive an abundance for the CS relative to H_2 in the hot core of 1.2x10^-8, considerably higher than the previous upper limit based on a single-dish spectral line survey. The difference can be explained as being due to beam dilution of the hot core component in the earlier, low-resolution study, and the confusion of the hot core with emission from the extended ridge. A similar result is also suggested for the sulphur-bearing molecules SO and SO_2, and existing models of sulphur chemistry are unable to reproduce these new abundance estimates. We conclude that models extending to higher temperatures and densities are required to explain these data.

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