COMPTEL observations of the Crab during the CGRO sky survey

Abstract

During the all-sky survey of the Compton Gamma Ray Observatory (CGRO) the Crab pulsar and nebula were observed several times. The unprecedented exposure allows detailed spectral shape determination together with a phase-resolved study of the Crab pulsar in the 0.75-30MeV energy range. We show that, except for the second peak, the phase-resolved COMPTEL data cannot be described by a simple extrapolation of the higher energy (50MeV-10GeV) EGRET best-fit power-law. Evidence was found for time variability of the unpulsed emission on a time scale of 16 months.

Department

Physics

Publication Date

7-1995

Journal Title

Astronomy and Astrophysics

Publisher

European Southern Observatory (ESO)

Document Type

Article

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