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Where has all the polarization gone? | | E. Middelberg
; A. L. Roy
; U. Bach
; D. C. Gabuzda
; T. Beckert
; | | Date: |
15 Sep 2003 | | Subject: | astro-ph | | Affiliation: | MPIfR), A. L. Roy (MPIfR, Giub), U. Bach (MPIfR), D. C. Gabuzda (UCC), T. Beckert (MPIfR | | Abstract: | We have observed the five radio galaxies NGC1052, NGC4261, Hydra A, Centaurus A and Cygnus A with polarimetric VLBI at 15 GHz to look for possible Faraday rotation in foreground absorbers. Only Cygnus A was found to be polarized at the level of 0.4 %, the other four objects were found to be unpolarized (<0.3 %). We discuss implications for magnetic field structures and physical conditions in the absorbers imposed by the absence of polarized emission at this high frequency. | | Source: | arXiv, astro-ph/0309385 | | Services: | Forum | Review | PDF | Favorites | |
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