NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-21 T11:24:19 PDT
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For refcode 1999AJ....118.1931V:
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Copyright by American Astronomical Society. Reproduced by permission
1999AJ....118.1931V THE GALACTIC MAGNETIC FIELD IN THE QUASAR 3C 216 T. VENTURI AND G. B. TAYLOR Received 1999 February 25; accepted 1999 July 21 ABSTRACT Multifrequency polarimetric observations made with the Very Long Baseline Array of the quasar 3C 216 reveal the presence of Faraday rotation measures (RMs) in excess of 2000 rad m^-2^ in the source rest frame in the arc of emission located at ~140 mas from the core. Rotation measures in the range -300 to +300 rad m^-2^ are detected in the inner 5 mas (~30 pc). While the rotation measure near the core can be explained as being caused by a magnetic field in the narrow-line region, we favor the interpretation for the high RM in the arc that it is caused by a "local" Faraday screen produced in a shock where the jet is deflected by the interstellar medium of the host galaxy. Our results indicate that a galactic magnetic field of the order of ~50 microG on a scale greater than 100 pc must be present in the ambient medium. Key words: galaxies: active-galaxies: individual (3C 216=0906+430) - galaxies: ISM-galaxies: jets-galaxies: nuclei-radio continuum
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