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Low-Frequency Cutoffs in Synchrotron Spectra and the Optical Spectrum of NP 0532

Published online by Cambridge University Press:  07 February 2017

Stephen L. O'Dell  and
L. Sartori
Stephen L. O'Dell
Affiliation:
Department of Physics and Center for Space Research, Massachusetts Institute of Technology, Cambridge, Mass., U.S.A.
L. Sartori
Affiliation:
Department of Physics and Center for Space Research, Massachusetts Institute of Technology, Cambridge, Mass., U.S.A.

Abstract

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We point out the existence of a natural low-frequency cutoff in the spectrum of a synchrotron source. The turnover frequency is eB/mc 〈sin Ψ〉, where Ψ is the pitch angle for the electron motion. The spectrum below the turnover goes as vn, where n is the index in the electron energy distribution. For the Crab pulsar, a model with B ~ 106–107G and 〈sin Ψ〉 ~ 10-3–10-2 provides a plausible explanation for the turnover observed in the infrared.

Type
Session 8
Information
Symposium - International Astronomical Union , Volume 46: The Crab Nebula , 1971 , pp. 457 - 459
Copyright
Copyright © Reidel 1971 

References

Neugebauer, G., Becklin, E. E., Kristian, J., Leighton, R. B., Snellen, G., and Westphal, J. A.: 1969 Astrophys. J. Letters 156, L115.Google Scholar
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