Geminga as a radio pulsar

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Geminga is the brightest gamma- and X-ray source. In contrast to more than 700 known pulsars, it was observed only in the gamma-ray, X-ray, and ultraviolet ranges and has been known for many years as the only "radiosilent" pulsar. Attempts to detect its radio emission at frequencies above 300 MHz failed. The radio pulsar Geminga with a period of 0.237 s was detected and studied at the Pushchino Radio Astronomy Observatory (Astrospace Center, Lebedev Physical Institute, Russian Academy of Sciences) at 102, 61, and 41 MHz. Its dispersion measure, DM = 3 +/- 0.5 pc cm^-3, corresponds to a distance of 150 +/- 30 pc. The pulsar's average profile may contain an interpulse. Geminga is the pulsar with the lowest luminosity. Its radio emission is variable in flux and in the shape of the average profile.

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