OSSE Upper Limits to Pulsar Gamma-Ray Emission
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
We present upper limits from CGRO Oriented Scintillation Spectrometer Experiment OSSE observations of pulsars and a summary of pulsar observations made with the Compton Gamma-Ray Observatory CGRO. We also report an upper limit to phase-averaged emission for the globular cluster 47 Tuc which is thought to contain many millisecond pulsars. The 2sigma upper limit is 3 x 10exp -5 photons sq cm sexp-1 keVexp-1 in the 50-150 keV energy range. The best predictor of a pulsar having a detectable gamma-ray emission appears to be the X-ray luminosities observed by the Rontgen Satellite ROSAT 0.1-2.4 keBV or the EINSTEIN Satellite 0.1-4.0 keV. We compare the gamma-ray data to models related to the inferred magnetic field, the spin down rate, anor the frequency. Apparent correlations indicated by the pulsars detected by OSSE and the CGRO Energetic Gamma Ray Experiment Telescope EGRET have counter-examples in all cases.