TeV Gamma-Ray Observations of Compton Gamma-Ray Observatory Pulsars: Evidence against Inverse-Compton Controlled Outer Gaps

Details TeV Gamma-Ray Observations of Compton Gamma-Ray Observatory Pulsars: Evidence against Inverse-Compton Controlled Outer Gaps TeV Gamma-Ray Observations of Compton Gamma-Ray Observatory Pulsars: Evidence against Inverse-Compton Controlled Outer Gaps

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..836n&link_type=abstract

Astrophysical Journal v.418, p.836

Astronomy and Astrophysics

Astronomy

29

Gamma Rays: Observations, Stars: Pulsars: General

Scientific paper

We present the first results of TeV γ-ray observations of the Compton Gamma-Ray Observatory γ-ray pulsar PSR 1706-44, indicating a spectral cutoff between ˜20 GeV and 600 GeV. Improved upper limits are also presented for the Vela pulsar and PSR 1509-58. These and other TeV results confirm similar cutoffs for these γ-ray pulsars as well as for Geminga. The polar cap model predicts such a spectral cutoff due to magnetic pair production, whereas the outer gap model for Vela-type pulsars predicts a similar cutoff resulting from the maximum synchrotron energy in the outer gap. The spectral flattening below a certain minimum energy, seen from all of these pulsars, is also consistent with the outer gap prediction. The predicted fluxes of TeV γ-rays for Vela and Geminga are, however, much larger than the observed upper limits. These TeV observations place constraints on any pulsar model which employs the inverse-Compton scattering of soft photons by primary TeV electrons at distances relatively far from the stellar surface.

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