Observations of the J=4-3 Transition of HCO+ in Orion Molecular CLOUD-1 GL961 MONOCEROS-R2 and NGC2071

Details Observations of the J=4-3 Transition of HCO+ in Orion Molecular CLOUD-1 GL961 MONOCEROS-R2 and NGC2071 Observations of the J=4-3 Transition of HCO+ in Orion Molecular CLOUD-1 GL961 MONOCEROS-R2 and NGC2071

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200..183p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 200:1,P.183, 1982

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Scientific paper

We have observed the HCO+ J=4 → 3 transition in OMC 1 and three other galactic sources which have self-reversed CO profiles. None of the sources show self-absorption in this line and, in NGC 2071 and Mon R2, the line wings, seen in CO and HCO+ 1 → 0, have disappeared. Minimum masses between 200 and l200Msun. are derived for the high-density cores; these lower limits will only be reduced significantly if HCO+ is much more abundant than has previously been thought. A new compact, optically thin source is postulated in OMC1. We find a rest frequency at 356.7344 i 0.0005 GHz for HCO+ 4 → 3 transition and values of 44.594440 ± 0.000014 GHz and 82.0 ± 2.4 kHz for the molecular constants B0 and D0.

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