Pressure broadening of radio recombination lines from multiple-component H II regions

Details Pressure broadening of radio recombination lines from multiple-component H II regions Pressure broadening of radio recombination lines from multiple-component H II regions

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..116s&link_type=abstract

Astronomy and Astrophysics, vol. 78, no. 1, Sept. 1979, p. 116-118.

Astronomy and Astrophysics

Astrophysics

10

H Ii Regions, H Lines, Hydrogen Ions, Pressure Broadening, Radiative Recombination, Radio Spectra, Spectral Line Width, H Alpha Line, H Beta Line, Luminous Intensity

Scientific paper

Theoretical calculations are presented which show that the peak integrated line intensity can fall dramatically due to the pressure broadening of lines from individual components within an unresolved H II region, with relatively little effect on the integrated line width. Such effects can explain the very low line-to-continuum ratios sometimes measured in aperture synthesis observations. They can also explain the low beta/alpha intensity ratios, even when the widths of the alpha and beta lines are equal; a low beta/alpha intensity ratio does not necessarily imply non-LTE.

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