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Very high energy gamma ray astronomyRecent results in ground based very high energy gamma ray astronomy are reviewed. The various modes of the atmospheric Cerenkov technique are described, and the importance of cosmic ray rejection methods is stressed. The positive detections of the Crab pulsar that suggest a very flat spectrum and time-variable pulse phase are discussed. Observations of other pulsars (particularly Vela) suggest these features may be general. Evidence that a 4.8 hr modulated effect was detected from Cyg X-3 is strengthened in that the exact period originally proposed agrees well with a recent determination of the X-ray period. The southern sky observations are reviewed, and the significance of the detection of an active galaxy (NGC 5128) is considered for source models and future observations.
Document ID
19760022030
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Grindlay, J. E.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1976
Publication Information
Publication: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays
Subject Category
Astronomy
Report/Patent Number
CFA/HEA-76-138
Accession Number
76N29118
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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