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Published January 15, 1979 | Published
Journal Article Open

The detection of the J = 3-2 lines of HCN, HNC, and HCO^+ in the Orion molecular cloud


We report the first measurements of the 1.1 mm (J = 3-2) lines of HCN, HNC, and HCO^+ in the Orion molecular cloud. The low-intensity broad velocity wings seen in the (1-0) lines of HCN and HCO^+ are greatly enhanced in the HCN (3-2) line but not in HCO^+ (3-2). No broad wings are seen in the HNC (3-2) line. The HCN observations suggest molecular hydrogen densities ~ 10^6 cm^(-3) in the broad wing source, and the differences between the lines of HCN and HCO^+ suggest that the lines may be formed in different regions within the source.

Additional Information

© 1979 American Astronomical Society. Received 1978 June 19; accepted 1978 July 24. We wish to thank the staff of the 200 inch for extending their normal work schedule to include daylight radio observations. The work done at Caltech was supported by the National Aeronautics and Space Administration grant NGL 05-002-207.

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Published - 1979ApJ___227__441H.pdf


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August 19, 2023
October 24, 2023