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

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

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..464b&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, Aug. 9, 1984, p. 464-469.

Astronomy and Astrophysics

Astronomy

38

Gamma Ray Astronomy, High Energy Interactions, Secular Variations, X Ray Sources, Binary Stars, Exosat Satellite, Heao 2, Light Curve, Stellar Models, Variable Stars

Scientific paper

Einstein Observatory and Exosat X-ray data from 1E0630 + 178 reveal an about 50 percent periodic emission at more than 59 s. This confirms the earlier SAS 2 and COS B findings on 2CG195 + 4 at E greater than 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 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 ultrahigh energy gamma-ray measurements.

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