High-resolution studies of 21 CM emission profiles

Details High-resolution studies of 21 CM emission profiles High-resolution studies of 21 CM emission profiles

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..267v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, July 1989, p. 267-278.

Other

15

Emission Spectra, H I Regions, Interstellar Matter, Interstellar Space, Spectral Line Width, Angular Resolution, High Resolution, Radio Telescopes

Scientific paper

High-resolution (4-arcmin beamwidth, 1.22-kHz bandwidth), high-sensitivity observations of 21-cm emission profiles have been decomposed into Gaussians. The peak in the histogram of linewidth distribution occurs at 3 km/s, corresponding to T(k) = 200 K, similar to that found in absorption-line studies. The new data on line widths are compared with the results of other studies and reveal that the characteristic width of the narrow component is dependent on angular resolution. No evidence for a component related to a warm neutral 'intercloud' medium around 5000-10,000 K is found. A pervasive broad component with linewidth from 30 to 50 km/s may be due to stray radiation.

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