Time Variable Faraday Rotation Measures of 3C-273 and 3C-279

Details Time Variable Faraday Rotation Measures of 3C-273 and 3C-279 Time Variable Faraday Rotation Measures of 3C-273 and 3C-279

2001-03-13

arxiv.org/abs/astro-ph/0103180v1

Astrophysical Journal Letters 550, L147, April 2001

Astronomy and Astrophysics

Astrophysics

Accepted to ApJ Letters. 12 pages, 5 figures

Scientific paper

10.1086/319653

Multifrequency polarimetry with the VLBA confirms the previously reported time-varying Faraday rotation measure (RM) in the quasar 3C-279. Variability in the RM and electric vector position angle (EVPA) of the jet component (C4) is seen making it an unreliable absolute EVPA calibrator. 3C-273 is also shown to vary its RM structure on 1.5 year time-scales. Variation in the RM properties of quasars may result from a Faraday screen which changes on time-scales of a few years, or from the motion of jet components which sample spatial variations in the screen. A new component emerging from the core of 3C-279 appears to be starting to sample such a spatial variation. Future monitoring of this component and its RM properties is suggested as a diagnostic of the narrow line region in 3C-279. We also present a new method of EVPA calibration using the VLA Monitoring Program.

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