Search for periodicities near 59 S in the COS-B gamma-ray data of 2CG195+04 (Geminga)

Astronomy and Astrophysics – Astronomy

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Emissivity, Gamma Rays, Periodic Variations, Radiation Sources, X Ray Sources, Cos-B Satellite, Data Acquisition, Pulsed Radiation, Radio Astronomy, Sas-2, Satellite Observation, Spaceborne Astronomy

Scientific paper

The COS-B data relating to five observations in the general direction of Geminga, spanning 6.7 years, were searched for pulsation near 59 s. The SAS-2 indication is not confirmed. An indication of a 59 s pulsation in the gamma ray emission from 2CG195+04 (Geminga) was reported. Early analysis of COS-B data supported the result while later improved statistics did not confirm it. Subsequently, detection of a 59 s pulsation in the emission from the direction of Geminga at ultra high gamma and X-rays was reported. Geminga was identified with the X-ray source 1E0630+128. The final COS-B data on Geminga which was observed five times for a total of 214 days are reported.

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