Detection of very high energy gamma-rays from the Crab nebula

Details Detection of very high energy gamma-rays from the Crab nebula Detection of very high energy gamma-rays from the Crab nebula

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gros.work...10a&link_type=abstract

Presented at the Gamma Ray Observatory Science Workshop, Greenbelt, MD, 10-12 Apr. 1989

Astronomy and Astrophysics

Astronomy

7

Cerenkov Counters, Crab Nebula, Gamma Ray Bursts, Pulsars, Photomultiplier Tubes, Radio Astronomy

Scientific paper

During the period October 1988 through December 1988, a search was made for very high energy gamma rays from the direction of the Crab nebula using the atmospheric Cerenkov technique. The detector consisted of seven-fold arrays of photomultiplier tubes at the focii of two 11-meter diameter solar concentrators situated in Albuquerque, New Mexico. A dc signal was detected from the Crab nebula with a statistical significance of 5.8 sigma after the application of various cuts designed to suppress the background of hadronic showers. A search for a pulsed component failed to identify a significant signal in phase with the radio pulse from the Crab pulsar. These results, with a threshold energy of 200 GeV, are in substantial agreement with high energy results recently reported by the Mt. Hopkins group.

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