The radio halos of pulsars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Halos, Pulsars, Radio Sources (Astronomy), Radio Spectra, Electron Emission, Interstellar Magnetic Fields, Nonthermal Radiation, Radio Telescopes, Relativistic Particles, Supernova Remnants, Synchrotron Radiation

Scientific paper

The results of a search for radio halos of 22 pulsars at a frequency of 102 MHz are reported. Sources of continuous radio emission G228.9+43.7, G55.7+3.4, and G98.4-76 were detected in the direction of the pulsars 0950+08, 1919+21, and 2217+47, respectively. The radio source G228+43.7 has been found to be a pulsar radio halo; the spectral index of this source is 2 + or - 1; the nonthermal spectrum is explained by synchrotron radiation from relativistic electrons injected by the pulsar in magnetic fields of pulsar origin. It is shown that a commonly used radio-halo model, based on synchrotron radiation from relativistic electrons in interstellar magnetic fields, is unacceptable. Finally, it is noted that the nonthermal radio source G98.4-7.6 can be interpreted as a radio halo of the pulsar 2217+47 or a supernova remnant.

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