Faraday rotation and physical conditions in the Crab Nebula

Details Faraday rotation and physical conditions in the Crab Nebula Faraday rotation and physical conditions in the Crab Nebula

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..231b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 231-240. Research supported by NSERC and University

Astronomy and Astrophysics

Astrophysics

18

Crab Nebula, Faraday Effect, Stellar Structure, Polarized Radiation, Pulsars, Stellar Magnetic Fields, Stellar Radiation, Stellar Winds

Scientific paper

New, high-resolution radio images of the Crab Nebula at four frequencies are presented. These are used to construct reliable depolarization and rotation measure (RM) maps. The polarization maps show considerable small-scale structure. The features in the RM map appear unrelated to any structure visible in the total intensity. The large-scale RM is remarkably constant at about -21 rad/sq m across the nebula, and is mostly external, with at most a small contribution from the nebula itself. The synchrotron-emitting regions are quite separate from those in which most of the Faraday rotation occurs. In the former, the scale size of the magnetic field structure is about 0.1 pc and the (thermal) densities are low. It is shown that the radio depolarization must be caused by a network of Faraday rotating filaments containing thermal material. Most of these filaments are too small to be seen individually, have a filling factor of about 0.3, and RMs of a few hundred radians per square meter.

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