Faraday rotation variations along radio jets: the magnetic field in galaxy and group halos

Details Faraday rotation variations along radio jets: the magnetic field in galaxy and group halos Faraday rotation variations along radio jets: the magnetic field in galaxy and group halos

2006-03-23

arxiv.org/abs/astro-ph/0603645v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, requires an.cls. To appear in the Proceedings of the International Conference: "The Origin and Evolution o

Scientific paper

10.1002/asna.200610580

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.

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