The galactic magnetic field in the quasar 3C216

Details The galactic magnetic field in the quasar 3C216 The galactic magnetic field in the quasar 3C216

1999-07-23

arxiv.org/abs/astro-ph/9907321v1

Astronomy and Astrophysics

Astrophysics

23 pages, 3 tables, 11 figures. To appear on The Astronomical Journal, November 1999 Issue

Scientific paper

10.1086/301070

Multifrequency polarimetric observations made with the Very Long Baseline Array of the quasar 3C216 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 - +300 rad/m**2 are detected in the inner 5 mas (~30 parsecs). while the rotation measures near the core can be explained as due to a magnetic field in the narrow line region, we favor the interpretation for the high RM in the arc as due to 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 galacit magnetic field of the order of 50 microGauss on a scale greater than 100 pc must be present in the galactic medium.

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