EDP Sciences
Free access
Volume 415, Number 2, February IV 2004
Page(s) 477 - 481
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20034313

A&A 415, 477-481 (2004)
DOI: 10.1051/0004-6361:20034313

Parsec-scale rotation-measure distribution in the quasar 3C 147 at 8 GHz

H. Y. Zhang1, D. C. Gabuzda2, R. D. Nan1 and C. J. Jin1

1  National Astronomical Observatories, Chinese Academy of Science, A20 Datun Road, Chaoyang District, Beijing 100012, PR China
2  Department of Physics, University College Cork, Cork, Ireland

(Received 12 September 2003 / Accepted 28 October 2003 )

VLBA polarization observations of the high-rotation-measure source 3C 147 were made at four frequencies in the available 8 GHz band. The distribution of total flux and rotation measure across the source has been imaged. The rotation measure of the inner jet of the source ( ${\sim}{-}1800$ rad m -2) is consistent with previous results. After removing the rotation of the plane of polarization due to a foreground screen, the derived intrinsic magnetic field structure of the source on parsec scales is roughly transverse to the predominant jet direction, indicating the presence of relativistic shocks or a dominant toroidal jet B-field component.

Key words: polarization -- galaxies: jets -- galaxies: magnetic fields -- galaxies: quasars: individual: 3C 147

Offprint request: H. Y. Zhang, hyzhang@bao.ac.cn

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