VLA observations of 21 centimeter H I absorption toward Cassiopeia A

Details VLA observations of 21 centimeter H I absorption toward Cassiopeia A VLA observations of 21 centimeter H I absorption toward Cassiopeia A

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...75..999b&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, April 1991, p. 999-1010.

Astronomy and Astrophysics

Astronomy

21

Absorption Spectra, Cassiopeia A, Nebulae, Radio Sources (Astronomy), Supernova Remnants, Very Large Array (Vla), Angular Resolution, Astronomical Spectroscopy, H Lines, Molecular Clouds

Scientific paper

A multiconfiguration aperture synthesis mapping of the Perseus arm H I absorption line toward Cas A has been performed using the VLA. The sensitivity achieved was sufficient to detect optical depths as low as 0.03 and as large as about 5 over a region about 5 arcmin in diameter. Optical depth images are presented as gray scale with contours superposed for 41 spectral channels showing H I absorption. Representative optical depth spectra are shown as a function of position over Cas A. The images represent a significant improvement in angular resolution over earlier aperture synthesis work. The H I images show much structure in the absorbing gas, with the morphology dominated by elongated structures.

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