Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may.l1402n&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #L14.02
Physics
Scientific paper
Radio polarization studies(Milne, D. K. 1987, Aust. J. Phys., 40, 771.) of the synchrotron emission from supernova remnants (SNR) have revealed a curious regularity: young SNR possess a predominantly radial magnetic field structure, whereas older remnants display circumferential fields consistent with simple compression of the interstellar B-field by the supernova shock wave. However, the origin of radial B-fields in young SNR has remained a mystery. We have explored via 2D and 3D numerical MHD simulations the suggestion by Gull(Gull, S. F. 1973, MNRAS, 161, 47) that the interstellar field is ``combed out" radially by dense fingers of stellar ejecta produced by the Rayleigh-Taylor instability acting on the decelerating contact surface between the stellar ejecta and swept-up ambient gas. We confirm the existence of the instability and quantify its affect on the magnetic field. Synthetic radio maps of the simulated SNR are produced and compared with observations. Interestingly, we find that the polarization properties of radio SNR may serve as a sensitive probe of the uniformity of the interstellar magnetic field.
Jun Byung-Il
Norman Michael
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