Multifrequency VLA observations of the Crab Nebula at different epochs - Expansion and radio spectra of filaments

Details Multifrequency VLA observations of the Crab Nebula at different epochs - Expansion and radio spectra of filaments Multifrequency VLA observations of the Crab Nebula at different epochs - Expansion and radio spectra of filaments

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..210v&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 15, 1992, p. 210-216.

Astronomy and Astrophysics

Astronomy

13

Crab Nebula, Pulsars, Radio Spectra, Stellar Evolution, Very Large Array (Vla), Astronomical Spectroscopy, Linear Polarization, Radio Astronomy, Stellar Magnetic Fields

Scientific paper

High-resolution radio maps of the filamentary structure of the Crab Nebula made using VLA data at 327, 1400, and 4800 MHz at epochs 1989.1, 1983.9, and 1984.5 are presented. The filaments in the outer regions show large proper motions consistent with the expansion of the nebula, although some anomalous motions or structural changes are seen in the northwestern boundary. The radio spectrum of the filaments steepens away from the center, with mean alpha approximately equal to 0.3 within 100 arcsec of the center and mean alpha approximately equal to 0.4 in the outer regions. The polarization at 6 cm suggests that the magnetic fields is along the filaments, especially in the loops and arches, having a possible origin in the toroidal magnetic field of the nebula. The spectrum suggests that, while the diffuse nebular emission is from pulsar-generated electrons, the filaments in the outer regions contain electrons generated by both pulsar and shock acceleration.

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