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Origin of Spectral Bands in the Crab Pulsar Radio Emission
1<a href="https://ror.org/00f809463">Institute for Advanced Study</a>, School for Natural Sciences, Princeton, New Jersey 08540, USA; Department of Astrophysical Sciences, <a href="https://ror.org/00hx57361">Princeton University</a>, Princeton, New Jersey 08544, USA; Institute for Theory and Computation, <a href="https://ror.org/03vek6s52">Harvard University</a>, Cambridge, Massachusetts 02138, USA; Department of Physics and Astronomy, <a href="https://ror.org/001tmjg57">University of Kansas</a>, Lawrence, Kansas 66045, USA; and Laboratory for Nuclear Science, <a href="https://ror.org/042nb2s44">Massachusetts Institute of Technology</a>, Cambridge, Massachusetts 02139, USA.
Abstract:
The model explaining the spectral "zebra" pattern of the high-frequency interpulse (HFIP) of the Crab pulsar radio emission is proposed. The observed emission bands are diffraction fringes in the spectral domain. The pulsar's own plasma-filled magnetosphere plays a role of a frequency-dependent "diffraction screen." The observed features such as the proportional band spacing, high polarization, constant position angle, and others are explained. The model allows one to perform "tomography" of the pulsar magnetosphere. Indeed, we have obtained the plasma density profile directly from observations, without assuming a particular magnetosphere. Our model is testable and several predictions are made. The two "high-frequency components" observed at the same frequencies as the HFIP are proposed to be related to HFIP.
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