OSSE Upper Limits to Pulsar Gamma-Ray Emission

Details OSSE Upper Limits to Pulsar Gamma-Ray Emission OSSE Upper Limits to Pulsar Gamma-Ray Emission

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450..784s&link_type=abstract

Astrophysical Journal v.450, p.784

Astronomy and Astrophysics

Astronomy

19

Gamma Rays: Observations, Stars: Pulsars: General

Scientific paper

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 2 σ upper limit is 3 × 10-5 photons cm-2 s-1 keV-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 Röntgen Satellite (ROSAT) (˜0.1-2.4 keV) 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, and/or the frequency. Apparent correlations indicated by the pulsars detected by OSSE and the CGRO Energetic Gamma-Ray Experiment Telescope (EGRET) have counterexamples in all cases.

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