A search for recombination lines at 42 MHz toward S140

Details A search for recombination lines at 42 MHz toward S140 A search for recombination lines at 42 MHz toward S140

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18..192s&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 192; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 6, June 1992, p. 483

Astronomy and Astrophysics

Astronomy

1

Carbon, Electron-Ion Recombination, Hydrogen Clouds, Interstellar Matter, Line Spectra, Background Radiation, Noise Temperature, Ultraviolet Radiation

Scientific paper

An upper limit of not greater than 0.00036 on the ratio of the line antenna temperature to the system temperature is obtained as a result of a search for carbon recombination lines (n of about 540) at 42 MHz toward S140. This limit indicates that the broadening of the absorption line C640-alpha is caused by large-scale motions with velocities greater than about 60 km/s. To account for the absence of C540-alpha and for the large width of C640-alpha, a model is suggested in which the lines are formed in clouds of neutral hydrogen (nH = 20 cu cm) distributed along the line of sight.

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