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Evidence for detection of 1-10 MeV emission from the Taurus region in 1971 AugustResults are reported for three observations of the Crab Nebula with a balloon-borne actively collimated NaI detector over the energy range from 0.2 to 10 MeV. Possible changes in instrument performance and environmental background levels during the balloon flights are investigated, and fits for source strength are made over four broad energy channels. X-ray power-law spectra and pulsed-flux fractions are determined for both the Crab Nebula and its pulsar, NP 0532. A statistically significant flux greatly in excess of the power law was detected above 1 MeV during one flight; this flux, which has declined by at least a factor of 4 or 5 at the times of more recent observations, is assumed to be real and is attributed to the nebula.
Document ID
19770049774
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gruber, D. E.
(California, University La Jolla, Calif., United States)
Ling, J. C.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena; California, University La Jolla, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1977
Publication Information
Publication: Astrophysical Journal
Subject Category
Space Radiation
Accession Number
77A32626
Funding Number(s)
CONTRACT_GRANT: NAS9-10670
Distribution Limits
Public
Copyright
Other

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