VLA observations of 1667 MHz OH absorption toward Cassiopeia A

Details VLA observations of 1667 MHz OH absorption toward Cassiopeia A VLA observations of 1667 MHz OH absorption toward Cassiopeia A

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..853b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 853-871.

Astronomy and Astrophysics

Astrophysics

23

Absorption Spectra, Hydroxyl Radicals, Radio Spectra, Stellar Spectrophotometry, Supernova Remnants, Molecular Clouds, Nebulae, Optical Thickness, Spectral Line Width

Scientific paper

The authors have mapped the 1667 MHz OH transition in the Perseus arm absorption feature toward the supernova remnant Cas A. Observations were made with the VLA, yielding maps with 7arcsec angular resolution and 1.1 km s-1 velocity resolution. The maps of OH optical depth reveal some 13 distinct molecular clouds, with mean angular diameters in the range 30arcsec - 60arcsec, and estimated masses between 20 and 170 M_sun;. From the observed line widths, the authors deduce that only three of the clouds are close to virial equilibrium. The majority appear to be unbound and should be dispersing on time scales of a few times 105yr. These results are compared with published maps of CO and H2CO of comparable resolution. The molecular clouds toward Cas A probably represent a population intermediate between diffuse H I clouds and dense molecular clouds associated with formation of massive stars.

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