Stark broadening in radio recombination lines towards the Orion Nebula

Details Stark broadening in radio recombination lines towards the Orion Nebula Stark broadening in radio recombination lines towards the Orion Nebula

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..116s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 116-121.

Astronomy and Astrophysics

Astronomy

21

H Lines, Hydrogen Recombinations, Orion Nebula, Radio Astronomy, Radio Spectra, Stark Effect, Electron Density (Concentration), Hydrogen Clouds, Radio Telescopes, Signal To Noise Ratios, Spectrograms

Scientific paper

An investigation of Stark broadening in hydrogen radio recombination lines was made by observing a series of adjacent higher order lines and a higher frequency unbroadened n-alpha line. Two different diameter telescopes provided the same angular resolution for the complete set of the lines. Collisional widths are proportional to n to the 4.4 power for quantum level n of about 60 to 174, in agreement with the current theory of Stark broadening. Two different sets of lines were observed with 1.5 and 2.6 arcmin beams toward the Orion Nebula to study effects of beam averaging on the observational characteristics of broadening. An increase of the beamwidth from 1.5 to 2.6 arcmin results in a decrease of the n-dependence of the collisional widths from 4.4 to 3.8 which can be explained by a nonhomogeneous model of the Nebula. Calculations of Stark broadening applied to the 1.5 arcmin observations give electron densities of (1 + or - 0.3) 10,000/cu cm.

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