OSSE Observations of the Crab Pulsar
Abstract
We present results of the Compton Gamma Ray Observatory OSSE observations of the Crab pulsar, made during MJD 48373-48406 (27 April 1991-30 May 1991) and MJD 48798-48804 (25 June 1992-1 July 1992). Pulsar light curves and spectra over the ~0.05 to 10 MeV range are presented. The arrival time of the gamma-ray peak and the radio peak agree to within 30 microsecs, which is better than the ~300 microsecs accuracy of the measurements. The overall pulse phase averaged spectrum in the 0.1-10 MeV range is well-fit by a power law of the form 0:05 x (E/0.13 MeV)(exp 1.99 plus or minus 0.03) photons sq cm s(exp -1). The outer-gap model (with gap parameter equal to 0.46) provided to us by Ho agrees with the data to better than 20%. The spectra of the bridge and second peak are slightly harder that the first peak as measured by the hardness ratio (~110-220 keV)/(~50-105 keV): P1 = 0.54 plus or minus 0.01, P2 = 0.63 plus or minus 0.01, bridge = 0.68 plus or minus 0.03. The phase of the two peaks in the light curve is constant over the 50-550 keV range to within the accuracy of the measurements (better than 0.02 in in phase).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1994
- Accession Number
- ADA464615
Entities
People
- David A. Grabelsky
- G. V. Jung
- J. Eric Grove
- James D. Kurfess
- Mark S. Strickman
- Melville P. Ulmer
- R. A. Cameron
- Robert L. Kinzer
- S. Lomatch
- S. M. Matz
- W. Neil Johnson
- William R. Purcell
Organizations
- United States Naval Research Laboratory