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Faraday rotation variations along radio jets: the magnetic field in galaxy and group halos
Author(s) -
Laing R. A.,
Canvin J. R.,
Cotton W. D.,
Bridle A. H.,
Parma P.
Publication year - 2006
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200610580
Subject(s) - physics , faraday effect , astrophysics , rotation (mathematics) , halo , galaxy , magnetic field , galaxy rotation curve , measure (data warehouse) , radio galaxy , geometry , quantum mechanics , database , computer science , mathematics
Our modelling of FR I 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. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)