High-resolution studies of 21 cm emission profiles
G. L. Verschuur, J. T. Schmelz;
AJ, 1989, 98, 267
ABSTRACT: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.
KEYWORDS: emission spectra, h i regions, interstellar matter, interstellar space, spectral line width, angular resolution, high resolution, radio telescopes
PERSOKEY:h_i, ,
CODE: verschuur89