Journal
ASTRONOMISCHE NACHRICHTEN
Volume 327, Issue 5-6, Pages 533-534Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asna.200610580
Keywords
galaxies : jets; radio continuum : galaxies; magnetic fields; polarization; magnetohydrodynamics (MHD)
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Our modelling of FRI radio jets as decelerating, relativistic flows allows us to derive their orientations accurately. We present images of Faraday rotation for two of these these objects (3C 31 and NGC 315) and show that the fluctuations of rotation measure (RM) are larger in the fainter (receding) jets, as expected if the rotation occurs in the hot galaxy/group halos. The gas density is much lower in NGC 315 and the RM fluctuations are only just detectable. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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