Radio recombination lines towards pulsars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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15

H Alpha Line, Line Spectra, Pulsars, Radiative Recombination, Radio Spectra, Brightness Temperature, Interstellar Radiation, Microwave Emission, Superhigh Frequencies

Scientific paper

H109-alpha and H110-alpha recombination-line emission has been searched for in the directions of five pulsars. In one of these directions, towards PSR 1641-45, a line apparently originating in the diffuse interstellar medium was detected. Based on the pulsar dispersion measures, a lower limit of 130 K is put on the electron temperature in the line-emitting regions, while an upper limit of about 3300 K is derived from the observed continuum brightness temperature. The clumping factor for the electrons in the line-emitting region is estimated to be about 20.

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