On the nature of 21 CM emission profile structure at high galactic latitude: Implications for the warm neutral medium

Details On the nature of 21 CM emission profile structure at high galactic latitude: Implications for the warm neutral medium On the nature of 21 CM emission profile structure at high galactic latitude: Implications for the warm neutral medium

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..287v&link_type=abstract

The Astronomical Journal, vol. 107, no. 1, p. 287-297

Astronomy and Astrophysics

Astronomy

23

Emission Spectra, H I Regions, Hydrogen, Neutral Gases, Spectral Line Width, Stellar Temperature, Hydrogen Clouds, Interstellar Matter, Line Spectra, Spectrum Analysis, Stellar Spectra

Scientific paper

Gaussian analysis of neutral hydrogen emission profiles obtained with the Arecibo 309 m, the National Radio Astronomy Obsevatory (NRAO) 140 ft, and the Hat Creek 25 m radio telescopes reveal three distinct linewidth regimes. Component 1 is typically from 25-50 km/s wide and may be due to Galactic emission in far sidelobes, although this remains to be proven. The bulk of this study concerns Component 2, a pervasive feature approx. 12 km/s wide (full width at half maximum brightness), although somewhat narrower toward the North Polar Spur. If this component is due to a warm neutral medium, its linewidth implies a temperature of approx. 3000 K, substantially lower than many of the canonical values for this medium in the literature. On the other hand, there is evidence to suggest that at least some of this component may be due to the superposition of unresolved cool features in the beam. Component 3 encompasses narrow fearures with linewidths in the 2-6 km/s range with the majority around 3 km/s.

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