Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..107d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 107-115.
Astronomy and Astrophysics
Astronomy
6
Formaldehyde, Interstellar Masers, Molecular Clouds, Radio Sources (Astronomy), Astronomical Models, Centimeter Waves, Continuous Spectra, H Ii Regions, Hydroxyl Emission, Molecular Absorption, Optical Thickness, Radial Velocity, Radio Telescopes, Very Large Array (Vla)
Scientific paper
The 6 cm H2CO absorption in the direction of W 3(OH) has been mapped with the Very Large Array with an angular resolution of 0arcsec.5 and a velocity resolution of 0.76 km s-1. Absorption by H2CO molecules is seen with velocities between -50 km s-1 and -43 km s-1. The H2CO velocities essentially span the range between the velocity of the ultracompact H II region W 3(OH) (-50 km s-1) and the mean velocity of the OH masers (-44.3 km s-1). The H2CO is not uniformly distributed but appears in clumps which are located just outside the H II region. The typical parameters of the clumps are: optical depth τ ≡ 0.7, diameter ≡0arcsec.6 and ΔV ≡ 1.6 km s-1. The distribution of the H2CO absorption is compared with that of NH3 (Guilloteau et al., 1983) and with the OH masers (Reid et al., 1980).
Dickel Helene R.
Goss William Miller
Lubenow A. F.
Rots Arnold H.
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