The Crab Nebula's Cosmic-Ray Acceleration Zone Revealed

Details The Crab Nebula's Cosmic-Ray Acceleration Zone Revealed The Crab Nebula's Cosmic-Ray Acceleration Zone Revealed

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...416..251k&link_type=abstract

Astrophysical Journal v.416, p.251

Astronomy and Astrophysics

Astronomy

10

Acceleration Of Particles, Ism: Cosmic Rays, Ism: Individual Name: Crab Nebula, Magnetohydrodynamics: Mhd

Scientific paper

We analyze and discuss the geometrical and physical properties of the geometrically coherent, and the time-variable radio spectral index perturbations near the center of the Crab Nebula recently discovered by Bietenholz & Kronberg.
Although the detailed explanation of the three-dimensional geometry of the α perturbations is not yet clear, we propose that they are the sites of electron acceleration by MHD waves. The MHD waves are also the cause of the isotropization of the plasma flow outside the inner "emission hole" at the Crab's center, and we show how the MHD turbulence near the shock produces the observed spectral index, α ˜ 0 in the α-ridges, and a somewhat steeper spectrum further out in the supernova remnant, as is also observed.
We also suggest a physical explanation for the "persistent" magnetic field cell structure, and the typical 10" cell size as determined from the projected magnetic field maps of Bietenholz & Kronberg.

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