HCO(+) observations of the W51 molecular cloud

Details HCO(+) observations of the W51 molecular cloud HCO(+) observations of the W51 molecular cloud

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..703c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 1, 1987, p. 703-724. Research supported by Ca

Astronomy and Astrophysics

Astronomy

6

Formyl Ions, Interstellar Chemistry, Interstellar Masers, Molecular Clouds, Molecular Spectra, Emission Spectra, Infrared Sources (Astronomy), Radiative Transfer, Star Formation, Velocity Distribution, Water Masers

Scientific paper

The W51 molecular cloud complex has been mapped in the HCO+ J = 1→0 and J = 3→2 transitions. The new data reveal the presence of a massive (105M_sun;) cloud having emission peaks coincident with the two principal sites of H2O maser emission. Additional H13CO+ measurements imply an HCO+ fractional abundance of at least 4×10-10, significantly higher than the values of 10-11 deduced from earlier measurements of hot-centred clouds. HCO+ absorption of the continuum source indicates the presence of a stream of low-excitation foreground material.

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