Observations of TeV gamma rays from the Crab nebula

Details Observations of TeV gamma rays from the Crab nebula Observations of TeV gamma rays from the Crab nebula

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..401g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 401-406.

Astronomy and Astrophysics

Astronomy

51

Crab Nebula, Energetic Particles, Gamma Ray Astronomy, Pulsars, Radio Astronomy, Satellite Observation

Scientific paper

Searches for TeV gamma-ray emission from the Crab with ground-based telescopes using the atmospheric Cerenkov technique have been conducted during the past three decades. Several marginally significant detections were claimed until the group at Whipple observatory, using the imaging technique, firmly established the Crab nebula as a steady TeV gamma-ray source. A different experimental design, based on fast timing measurements of the Cerenkov light front with an array of independent detectors, was developed at Saclay to build the ASGAT TeV gamma-ray telescope in southern France. Using this instrument the Crab was tracked for 50 h during the 1991-1992 winter period. Analysis of the data revealed a gamma-ray signal from the Crab 3 at the 5.7 sigma level. The signal shows no modulation at the pulsar frequency. It is thereby confirmed that at TeV energies the unpulsed emission, presumably arising from the nebula, emerges as the main component while the gamma-ray radiation from the pulsar must be strongly attenuated above some cut-off energy between a few GeV and a few hundred GeV.

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