Observations of the J = 1-0 transition of HCO/+/ in southern molecular clouds

Details Observations of the J = 1-0 transition of HCO/+/ in southern molecular clouds Observations of the J = 1-0 transition of HCO/+/ in southern molecular clouds

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..911b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 911-917.

Astronomy and Astrophysics

Astronomy

19

Electron Transitions, Interstellar Gas, Molecular Clouds, Positive Ions, Radio Sources (Astronomy), Southern Sky, Galactic Nuclei, Hydrocyanic Acid, Ion Density (Concentration)

Scientific paper

The J = 1-0 transition of HCO(+) at 89 GHz has been detected with the 4-m Epping radio telescope at 42 positions out of a total sample of 55 associated with dense molecular clouds (mostly with southern declinations). The telescope beamwidth was 3.3 arcmin and the sensitivity limit was 0.5-0.75 K in 'corrected antenna temperature'. The lower limit for the typical HCO(+) column density, based on assumptions of low optical depth and an excitation temperature of 15 K, is 3 x 10 to the 13th per sq cm. The velocities of the HCO(+) emission are similar to those of ground-state transitions of CO, CS, HCN; there is also a strong correlation between the HCO(+) and HCN profile areas. Extensive HCO(+) emission has been observed in the Galactic Center region, associated with a dense molecular cloud complex in the nuclear disk. Faint HCO(+) emission is presented in N159 in the Large Magellanic Cloud and possibly in NGC 5128.

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