Where has all the polarization gone?

Details Where has all the polarization gone? Where has all the polarization gone?

2003-09-15

arxiv.org/abs/astro-ph/0309385v1

Astronomy and Astrophysics

Astrophysics

To be published in "Future Directions in High Resolution Astronomy" (Celebration of the 10th Anniversary of the Very Long Base

Scientific paper

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.

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