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The Rotation Measure of Background Radio Sources Seen Through the Supernova Remnant OA184 (G166.2+2.5)

Published online by Cambridge University Press:  12 April 2016

K.-T. Kim ,
P.P. Kronberg  and
T.L. Landecker
K.-T. Kim
Affiliation:
University of Toronto, Canada
P.P. Kronberg
Affiliation:
University of Toronto, Canada
T.L. Landecker
Affiliation:
Dominion Radio Astrophysical Observatory, Penticton, B.C., Canada

Abstract

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Radio sources in the field of the extended SNR OA184 (G166.2+2.5) have been studied to determine the excess rotation measure (RM) arising from the SNR. Of a total of 32 radio sources observed with the VLA in the C configuration, eight are found to be polarized above 7σ The sources seen through the SNR show significantly high RM in comparison to background sources. The excess RM due to the Faraday active plasma in the SNR is estimated to be 150±20 rad m−2, which corresponds to . The sign of RMs of the sources within an area of about 2°×2° centred on the SNR shows a systematic longitudinal polarity change on either side of l ≈ 166°.2. Although a larger sample is needed to justify this, we tentatively interpret this “flip” as due to the reversal of an irregular component of the galactic magnetic field on a scale of order 100 pc.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 101: Supernova Remnants and the Interstellar Medium , 1988 , pp. 355 - 358
Copyright
Copyright © Cambridge University Press 1988

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