Very High Energy Gamma Rays from the Vela Pulsar Direction

Details Very High Energy Gamma Rays from the Vela Pulsar Direction Very High Energy Gamma Rays from the Vela Pulsar Direction

1997-07-17

arxiv.org/abs/astro-ph/9707203v1

Astrophys.J.487:L65-L68,1997

Astronomy and Astrophysics

Astrophysics

18 pages, 3 figures, LaTeX with AASTeX, accepted for publication in ApJ Letters

Scientific paper

10.1086/310874

We have observed the Vela pulsar region at TeV energies using the 3.8 m imaging Cherenkov telescope near Woomera, South Australia between January 1993 and March 1995. Evidence of an unpulsed gamma-ray signal has been detected at the 5.8 sigma level. The detected gamma-ray flux is (2.9 +/- 0.5 +/- 0.4) x 10^-12 photons cm^-2 sec^-1 above 2.5 +/- 1.0 TeV and the signal is consistent with steady emission over the two years. The gamma-ray emission region is offset from the Vela pulsar position to the southeast by about 0.13 deg. 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) x 10^-13 photons cm^-2 sec^-1 above 2.5 +/- 1.0 TeV.

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