The synchrotron bays of the Crab Nebula - A magnetic structure associated with a presupernova circumstellar disk

Details The synchrotron bays of the Crab Nebula - A magnetic structure associated with a presupernova circumstellar disk The synchrotron bays of the Crab Nebula - A magnetic structure associated with a presupernova circumstellar disk

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..599f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 599-610.

Astronomy and Astrophysics

Astrophysics

31

Crab Nebula, Protostars, Stellar Magnetic Fields, Supernova Remnants, Synchrotron Radiation, Pulsars, Stellar Winds

Scientific paper

We investigate the nature of two large conical indentations in the Crab Nebula's synchrotron emission, commonly known as the east and west 'bays'. Optical images spanning nearly nine decades (1899-1988) reveal the bays to be long-lasting remnant features. Proper motions of the bays away from the remnant's center of expansion are consistent with their locations near the SN progenitor site in A.D. 1054. Based on their morphologies and polarization properties, the bays appear to be portions of a torus encircling the remnant's center of expansion. The nebular magnetic field wrapped around this torus blocks the pulsar's relativistic particles, resulting in the observed lack of synchrotron emission. We propose that this torus is the result of a presupernova disklike ejection not less than 0.1 solar mass by the Crab progenitor, similar to the ring around SN 1987 A. A 0.5 solar mass disk of He-rich filaments along the equatorial plane is probably also related to presupernova mass loss, which might explain the wide range of abundances seen among filaments.

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