Very High Energy Gamma Rays from the Vela Pulsar Direction

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Abstract
We have observed the Vela pulsar region at TeV energies using the 3.8 m imaging Čerenkov telescope near Woomera, South Australia between 1993 January and 1995 March. Evidence of an unpulsed gamma-ray signal has been detected at the 5.8 σ level. The detected gamma-ray flux is (2.9 ± 0.5 ± 0.4) × 10-12 photons cm-2 s-1 above 2.5 ± 1.0 TeV, and the signal is consistent with steady emission over the 2 years. The gamma-ray emission region is offset from the Vela pulsar position to the southeast by about 013. No pulsed emission modulated with the pulsar period has been detected, and the 95% confidence flux upper limit to the pulsed emission from the pulsar is (3.7 ± 0.7) × 10-13 photons cm-2 s-1 above 2.5 ± 1.0 TeV.

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