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Faraday Rotation Measure Observations on the Pc-Scale: Probing the AGN Environment

Published online by Cambridge University Press:  12 April 2016

G. B. Taylor ,
T. Venturi  and
P. S. Udomprasert
G. B. Taylor
Affiliation:
National Radio Astronomy Observatory, Socorro, NM 87801, U.S.A.
T. Venturi
Affiliation:
Istituto di Radioastronomia CNR, Bologna, Italy
P. S. Udomprasert
Affiliation:
Princeton University, Princeton, NJ 08544, U.S.A.

Abstract

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We present multi-frequency VLBA polarimetric observations of a small sample of quasars revealing their Faraday rotation measure (RM) structure at ~ 1 mas resolution. Two of the sources (OQ 172 and 3C 216) were chosen on the basis of high RMs seen by the VLA and single dish telescopes. A few more typical quasars (3C 273, 3C 279, 3C 345 and 3C 380) were also included in the study. In OQ 172, 3C 273, 3C 279 and 3C 380 we find high RMs (>3000 rad m−2) associated with the nuclear region. Only 1-10 mas from the nucleus the jet |RM|s in all 4 of these sources fall to less than 100 rad m−2. This RM structure may be produced by strong magnetic fields in the the narrow line region of the quasar.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 113 - 114
Copyright
Copyright © Astronomical Society of the Pacific 1998

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