Faraday rotation and depolarization in the powerful DRAGNs 3C 34, 3C 228 and 3C 340

Details Faraday rotation and depolarization in the powerful DRAGNs 3C 34, 3C 228 and 3C 340 Faraday rotation and depolarization in the powerful DRAGNs 3C 34, 3C 228 and 3C 340

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..877j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 4, pp. 877-905.

Astronomy and Astrophysics

Astronomy

38

Magnetic Fields, Polarization, Methods: Data Analysis, Intergalactic Medium, Galaxies: Jets, Radio Continuum: Galaxies

Scientific paper

We have mapped the distributitions of Faraday rotation and depolarization across the extended lobes of the DRAGNs (`double radiosources associated with galactic nuclei') 3C34, 228 and 340. Our analysis uses a new algorithm for estimating position-dependent errors in synthesis images, which makes it possible to determine robust errors for derived parameters. The distribution of both depolarization and rotation measure is patchy, and bears no detailed relation to the total intensity structure. We do corroborate two trends found in lower resolution data, namely that there is more depolarization close to the centre, and that there is less depolarization on the jet side (the Laing-Garrington effect). The observations favour an origin for the Faraday rotation in a hot halo around the radio galaxy, with a field tangled on a range of scales and with an energy density of ~1 per cent of the thermal energy density in the halo. However, we cannot rule out the possibility that the rotation is due to halo material mixed into the radio lobes. We find two new examples of depolarization `silhouettes': one, in 3C34, is caused by a galaxy in the surrounding rich cluster; the other, in 3C340, is caused by a faint foreground galaxy apparently involved in a tidal interaction.

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