Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..101c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 1, 1984, p. 101-110.
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Formaldehyde, Hydrogen Clouds, Molecular Clouds, Radio Astronomy, Absorption Spectra, Angular Resolution, Astronomical Maps, Carbon Monoxide, Centimeter Waves, Gas Density, Line Spectra, Radial Velocity
Scientific paper
Formaldehyde 6-cm absorption has been mapped over the W3 region of l = 132.3-134.7 deg, b = 0-1.7 deg, with an angular resolution of 10 arcmin, a velocity resolution of 0.54 km/s, and an rms noise level of 0.02 K. Maps are presented of the formaldehyde line integral and radial velocity over the region. Formaldehyde traces the same large-scale cloud structure as CO. There is excellent agreement between the two species except for the W3 (OH) concentration where the excitation of the formaldehyde line appears to be suppressed because of the high gas density. An overall mass of molecular hydrogen of 70,000 solar masses is implied by the formaldehyde measurements. The masses of individual concentrations are in reasonable agreement with their virial masses, but this could be due to an observational selection effect which is discussed.
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