A rotating protocluster in W58 - HCO(+) aperture synthesis maps

Details A rotating protocluster in W58 - HCO(+) aperture synthesis maps A rotating protocluster in W58 - HCO(+) aperture synthesis maps

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..568v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 568-579.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Maps, Molecular Clouds, Nebulae, Positive Ions, Angular Velocity, Data Reduction, Emission Spectra, H Ii Regions, Interferometry, Kinematics, Organic Compounds, Rotating Matter

Scientific paper

The angular resolution has been limited at the millimeter wavelengths where most molecules have rotational transitions, and, consequently, the structure and kinematics of the more distant molecular clouds are poorly known. However, newly developed aperture synthesis techniques make it now possible to study these clouds in more detail. In connection with a survey of small-scale structure in molecular clouds with a millimeter interferometer, indications of systematic velocity structure near the H II region K3-50 were discovered. A study involving a full aperture synthesis of the region was, therefore, undertaken. The area mapped lies in W58, an extended complex about 9 kpc from the sun containing clouds of molecular gas and dust, compact and mature H II regions, and compact and extended infrared sources. The HCO(+) maps reveal a remarkable systematic velocity gradient of 8.0 km/(s pc) over a distance of more than 1 pc. The velocity gradient is found to be caused by rotation of the cloud, which has apparently collapsed from a massive envelope.

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