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Evidence for an increasing 59-s period in the X-ray emission from Geminga

Caraveo, P. A.; Bignami, G. F.; Paul, J. A.

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 per…

Exosat observation of the candidate X-ray counterpart of Geminga

Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +2 more

During a search for X-ray counterparts of the COS B>=100 MeV γ-ray sources (see refs 1, 2), observations using the Einstein Observatory revealed a new X-ray source, 1E0630 + 178, inside the ~1/2 square degree error box of the γ-ray source 2GC195+4, `Geminga'³. On the basis of its interesting properties, this source has been proposed …

X-ray astronomy: Milestone for EXOSAT

Watson, Mike