HCO/+/ emission in the galacic center region. I - Observations

Details HCO/+/ emission in the galacic center region. I - Observations HCO/+/ emission in the galacic center region. I - Observations

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..147f&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 147-154. Research supported by the Japan Society for the Promotion of

Astronomy and Astrophysics

Astrophysics

14

Astronomical Maps, Galactic Nuclei, Molecular Clouds, Density Distribution, Formaldehyde, Hydrocyanic Acid, Molecular Ions, Self Absorption

Scientific paper

HCO(+) emission (3.4 mm, J = 1-0) in the galactic center region has been observed toward the dense molecular clouds near Sgr A and Sgr B2 at over 20 points. The profiles are asymmetric, and are very widely extended in velocity like the C-12(O) line in spite of the high excitation requirements of the HCO(+) line. A position-velocity map along the galactic plane including the galactic nucleus was obtained. Comparison with the HCN emission leads us to the conclusion that the number density ratio HCO(+)/HCN is higher by an order of magnitude in the diffuse region. This behavior is discussed in terms of the ion-molecule reaction scheme. A dip at 0 km/s, which is probably due to self-absorption by foreground cold molecular gas, was found in the HCO(+) profiles as well as in spectra of HCN.

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