High-energy gamma radiation from Geminga observed by EGRET

Details High-energy gamma radiation from Geminga observed by EGRET High-energy gamma radiation from Geminga observed by EGRET

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421..276m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 1, p. 276-283

Astronomy and Astrophysics

Astronomy

75

Energy Spectra, Gamma Ray Telescopes, Gamma Rays, Pulsars, Sky Surveys (Astronomy), Gamma Ray Astronomy, Gamma Ray Observatory, X Rays

Scientific paper

The Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (CGRO) has carried out extensive studies of the gamma-ray source Geminga. Following the detection of pulsed X-rays (Halpern and Holt 1992) from Geminga, Bertsch et al. (1992) reported the same 237 ms periodicity to be visible in the EGRET data. A full analysis of the Geminga source shows that the energy spectrum is compatible with a power law with a spectral index of -1.50 +/- 0.08 between 30 MeV and 2 GeV. A falloff relative to the power law is observed for energies above 2 GeV. Phase-resolved spectra also show power laws with high-energy cutoffs, but with significant variation of the spectral index with phase. No unpulsed emission is observed. No evidence for time variation was found within the EGRET observations.

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