Detailed structure of the small high-velocity cloud HVC 132+23-211

Details Detailed structure of the small high-velocity cloud HVC 132+23-211 Detailed structure of the small high-velocity cloud HVC 132+23-211

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...33..383h&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 33, Sept. 1978, p. 383-406.

Astronomy and Astrophysics

Astronomy

16

Astronomical Maps, Hydrogen Clouds, Brightness Temperature, Radio Astronomy, Relief Maps, Spectral Line Width

Scientific paper

A complete 21-cm map of the high-velocity H I cloud HVC 132+23-211 is presented which was obtained from observations with a 100-m telescope at a resolution of 3.255 kHz or 0.69 km/s. Contour maps of brightness temperature in the latitude-longitude plane at fixed velocities and in the latitude-velocity plane at the longitudes observed are provided. The majority of the profiles are found to have half-widths of 10 to 15 km/s and intensities up to about 3 K and are shown to constitute a small cloud with dimensions of about 1.5 x 3.0 deg of arc, in which are embedded about 15 very bright and very small cores with narrow profiles. It is suggested that HVC 132+23-211 originated as a smooth cloud and that the cores, which are presumed to be (thermal) shock instabilities, developed as a secondary phenomenon.

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