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SAS-2 High energy gamma-ray observations of the Vela pulsarThe second Small Astronomy Satellite high-energy (35 MeV) gamma-ray telescope detected pulsed gamma-ray emission at the radio period from PSR 0833-45, the Vela pulsar, as well as an unpulsed flux from the Vela region. The pulsed emission consists of two peaks, one following the radio peak by about 13 msec, and the other 0.4 period after the first. The luminosity of the pulsed emission above 100 MeV from Vela is about 0.1 that of the pulsar NP0532 in the Crab nebula, whereas the pulsed emission from Vela at optical wavelengths is less than 0.0004 that from the Crab. The relatively high intensity of the pulsed gamma-ray emission and the double peak structure, compared to the single pulse in the radio emission, suggests that the high energy gamma-ray pulsar emission may be produced under different conditions from those found at lower energies.
Document ID
19750015349
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fichtel, C. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kniffen, D. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Oegelman, H. B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
April 1, 1975
Subject Category
Astronomy
Report/Patent Number
NASA-TM-X-70877
X-662-75-102
Accession Number
75N23421
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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