Gamma-Ray and Radio Observations of PSR B1509-58
NORTHWESTERN UNIV EVANSTON IL DEPT OF PHYSICS AND ASTRONOMY
Pagination or Media Count:
We report concurrent radio and gamma-ray observations of PSR B1509-58 carried out by the Parkes Radio Telescope and by the Burst and Transient Source Experiment BATSE and the Oriented Scintillation Spectrometer Experiment OSSE on the Compton Gamma Ray Observatory CGRO-Gamma-ray light curves fitted at several energies between 20-500 keV yield a phase offset with respect to the radio pulse that is independent of energy, with an average value 0.32 plus or minus 0.02. Although this value is larger by 0.07 than that reported by Kawai et al., the difference is not statistically significant only2 sigma when account is taken of the uncertainty associated with their result. We briefly discuss the possibility that the energy-independence of the gamma-ray pulse phase is a signature of non-thermal radiation in the X-raygamma-ray range and the suggestion of a dependence of pulsar radio-gamma-ray phase offset on pulse period.