Abstract
Einstein Observatory and Exosat X-ray data from 1E0630 + 178 reveal a ∼50% periodic emission at ≥59 s. This confirms the earlier SAS 2 and COS B findings on 2CG195 + 4 at E> 50 MeV, and provides the temporal signature for the identification of Geminga. The observations, spanning over a decade (1973–83), also suggest a very high positive period derivative, P, which has become still higher between 1979 and 1983. A simple source scenario is proposed, based on a binary system containing a compact object responsible for the high energy emission, and also taking into account recent ultra high energy γ-ray measurements.
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