Detection of HCO(+) and HCN absorption towards three galactic H II-regions

Details Detection of HCO(+) and HCN absorption towards three galactic H II-regions Detection of HCO(+) and HCN absorption towards three galactic H II-regions

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120..307n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 2, April 1983, p. 307-312.

Astronomy and Astrophysics

Astrophysics

46

Formaldehyde, H Ii Regions, Hydrocyanic Acid, Interstellar Matter, Molecular Clouds, Absorption Spectra, Continuous Spectra, Line Of Sight, Molecular Spectra, Spectrum Analysis

Scientific paper

HCO+ and HCN absorption have been detected towards W49, W51 and DR 21 and a detection limit has been placed on HNC absorption towards W49. The velocities of the lines imply absorbing gas near the sources as well as in diffuse spiral arm clouds. The observations suggest that HCO+ and HCN are abundant in low density clouds. Self-absorption features and absorption in gas close to the sources show that molecular clouds can be surrounded by low density, absorbing gas, which may seriously distort the emission spectra used to derive molecular cloud parameters.

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