A Long-Term Study of High-Energy Gamma-Ray Emission from the Vela, Geminga, and Crab Pulsars

Details A Long-Term Study of High-Energy Gamma-Ray Emission from the Vela, Geminga, and Crab Pulsars A Long-Term Study of High-Energy Gamma-Ray Emission from the Vela, Geminga, and Crab Pulsars

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450..791r&link_type=abstract

Astrophysical Journal v.450, p.791

Astronomy and Astrophysics

Astronomy

35

Gamma Rays: Observations, Stars: Pulsars: Individual Name: Crab Pulsar, Stars: Pulsars: Individual Name: Geminga, Stars: Pulsars: Individual Name: Vela Pulsar

Scientific paper

We have analyzed ˜3 yr of data on the Vela, Geminga, and Crab pulsars in the energy range 30 MeV to 30 GeV, gathered by the EGRET detector aboard the Compton Gamma Ray Observatory, to study long-term variability in the various characteristics of high-energy gamma-ray emission by these objects. The light curves at energies ≥ 100 MeV are generally constant in time. However, it is noticed that occasionally the emission of high-energy gamma rays under one of the two peaks of the Vela and Crab pulsars is significantly less than the long-term average. The ratio of background-subtracted pulsed intensities under the two peaks, P2/P1, in the Crab pulsar is consistent with both the hypotheses of a 13.5 yr sinusoidal variation and a constant (no variation) ratio. While the integral flux at E ≥ 100 MeV is nearly constant in the case of the Crab pulsar, it appears to be variable in the cases of the Vela and Geminga pulsars. The slopes of the energy spectra show evidence of variability particularly for the Vela and Geminga pulsars.

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