Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..131c&link_type=abstract
In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 131-134 (SEE N85-33902 22-93)
Astronomy and Astrophysics
Astronomy
3
Crab Nebula, Flux (Rate), Gamma Rays, Statistical Analysis, Time Measurement, Radiation Detectors, Radio Emission, Radio Sources (Astronomy), Variations
Scientific paper
Since the development of gamma-ray astronomical telescopes, the Crab Nebula has been a prime target for observations. From 100 to 1000 MeV, the pulsar PSR0531 is the dominant source with a light-curve similar to that seen at lower energies; there is also some evidence for longterm amplitude variations but none for emission from the Nebula itself. In the very high energy gamma-ray region there have been reported detections of pulsed emission with longterm time variations from minutes to months. Recently a pulsed flux has been reported that resisted over a long time interval. The detection of a flux from the Nebula at the 3 sigma level at energies of 3x1011eV was reported; there was no evidence of periodic emissions on any time scale during the three years of observations. A new measurement of very high energy gamma rays from the Crab Nebula is reported using the imaging system on the Whipple Observatory 10m reflector.
Cawley Michael F.
Gibbs Kenneth
Gorham Peter. W.
Lamb Richard C.
Liebing D. F.
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