H I emission-absorption measurements of the radio source CL4

Details H I emission-absorption measurements of the radio source CL4 H I emission-absorption measurements of the radio source CL4

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..611p&link_type=abstract

Astronomical Journal, vol. 84, May 1979, p. 611-614.

Astronomy and Astrophysics

Astronomy

1

Absorption Spectra, H Lines, Radio Sources (Astronomy), Optical Thickness, Radio Emission, Supernova Remnants

Scientific paper

An emission-absorption study of the radio source CL4 has revealed two weak features at -9.3 and -35.6 km/s LSR velocity that may be due to H I absorption. If real, these features imply optical depths of about 0.6. The kinematic distances implied by the features (6.4 and 8.7 kpc) exceed that of the Cygnus Loop (about 1 kpc) by a large factor. However, because of the anomalous H I velocities found in this region, kinematic distances may be meaningless, and a spatial coincidence of CL4 with the Cygnus Loop supernova remnant cannot be completely ruled out.

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