EGRET Gamma-Ray Observations of the Crab P2/P1 Ratio
Abstract
Recent observations of the Crab pulsar by the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory show that the high-energy gamma-ray light curve has changed little over the lifetime of the instrument. Previous data collected by SAS 2 and COS B in the years 1972-1982, along with earlier EGRET data, suggested a 14 yr sinusoidal variation in the flux ratio between the first and second peaks. The new data from EGRET indicate that the flux ratio is constant.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1997
- DOI:
- 10.1086/304604
- arXiv:
- arXiv:astro-ph/9705025
- Bibcode:
- 1997ApJ...487..385T
- Keywords:
-
- Gamma Rays: Observations;
- pulsars: individual (Crab);
- Astrophysics
- E-Print:
- 6 pages, 3 figures. To be published in ApJ