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Title:
A Faint Polarized Arc Near the Supernova Remnant MSH:15-52 G:320.4-1.2
Authors:
Milne, D. K.; Caswell, J. L.; Haynes, R. F.
Publication:
R.A.S. MONTHLY NOTICES V.264, NO. 4/OCT15, P. 853, 1993 (MNRAS Homepage)
Publication Date:
10/1993
Origin:
KNUDSEN
MNRAS Keywords:
magnetic fields - polarization - ISM: individual: G320.4-1.2 - ISM: supernova remnants - radio continuum: interstellar
Bibliographic Code:
1993MNRAS.264..853M

Abstract

The Galactic radio source MSH 15-52 (G 320.4-1.2) is a 30-arcmin non-thermal complex associated with the optical nebula RCW 89 and believed to be the remnant of a supernova; it contains the X-ray and radio pulsar PSR 1509-58, and it is assumed that an association with the SNR exists. In this paper we present a radio polarization study of this region which shows the presence of a polarized ring or shell, ˜40 arcmin in diameter, either extending from G 320.4-1.2 or coincident with part of it. The distributions of Faraday rotation and depolarization are also presented for this region. While G 320.4-1.2 clearly has a radial projected magnetic field, the field in the large ring is tangential, which suggests that it may be a blow-out from G 320.4-1.4. An alternative interpretation is that this new feature is a separate supernova remnant, G 320.6-1.6.

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