Methanol in the Orion region. I - Millimeter-wave observations. II - The 25 GHz masers revisited

Details Methanol in the Orion region. I - Millimeter-wave observations. II - The 25 GHz masers revisited Methanol in the Orion region. I - Millimeter-wave observations. II - The 25 GHz masers revisited

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..253m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 253-273.

Astronomy and Astrophysics

Astrophysics

112

Cosmochemistry, Methyl Alcohol, Orion Nebula, Stellar Composition, Abundance, Brightness Distribution, Line Spectra, Millimeter Waves, Spatial Distribution, Star Formation, Thermal Emission

Scientific paper

The IRAM 30-cm telescope has been used to observe a number of methanol (CH3OH) transitions, including four lines of 13CH3OH towards OMC-1. The authors also observed selected methanol lines towards some of the clumps in the OMC-1/OMC-2 region. The mapping data shows that the methanol emission is extremely peaked towards the KL-region as well as towards the 400 μm source 100arcsec to the south. The optical depths of the CH3OH lines towards Orion-KL are found to be not high. The 13C species may be considerably enriched in methanol. In the ridge condensations, the authors derive lower CH3OH abundances (10-8) similar to the values found in dark clouds. The H2 densities in these condensations are found to be of order 106cm-3 consistent with earlier results. This suggests a high degree of clumping even in regions far from Orion-KL.

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