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The X-Ray Spectra of Cygnus XR-1 and the Crab Nebula

Published online by Cambridge University Press:  30 March 2016

Laurence E. Peterson
Laurence E. Peterson*
Affiliation:
University of California, San Diego, La Jolla, Calif., U.S.A.

Extract

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In this paper we wish to present briefly the latest results which have been obtained on the hard X-ray spectra of two strong sources in the Northern skies. These observations, which have been discussed in detail previously (Peterson et al., 1967), were made from balloons launched at Palestine, Texas, to 3 gm/cm2 atmospheric depth during September 1966. The Crab Nebula and the Cygnus XR-1 were observed to have a differential number power law spectra with an index of about –2 over the 20–200 keV range. Both sources have the same intensity within about 10%. The Crab Nebula has been observed on two occasions, one year apart, and showed no change in intensity over this range at about a 5% significance level.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 1: Highlights of Astronomy. As presented at the XIIIth General Assembly of the IAU, 1967 , 1968 , pp. 202 - 205
Copyright
Copyright © Reidel 1968

References

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