Radio recombination lines from the Galactic plane in Cygnus

Details Radio recombination lines from the Galactic plane in Cygnus Radio recombination lines from the Galactic plane in Cygnus

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147..237b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 2, June 1985, p. 237-240. Research supported by the Comision Asesora

Astronomy and Astrophysics

Astronomy

8

Cygnus Constellation, Emission Spectra, Interstellar Extinction, Line Spectra, Radio Astronomy, Electron Recombination, Electron Transitions, H Alpha Line, Ionized Gases

Scientific paper

Radio recombination lines were observed from the galactic plane over 75° ≤ l ≤ 86° at two fequencies, 1.4 and 2.3 GHz, using different telescopes to obtain comparable angular resolution at the two transitions. The emission seems to come from gas that is optically very thin. Estimates of the emission measure derived from the recombination lines, when combined with Hα observations, imply visual extinctions of >6m in some directions, and a distance of >1 kpc to most of the nebulae.

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