Where has all the polarization gone?
Astrophysics
2007-05-23 v1
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.
Cite
@article{arxiv.astro-ph/0309385,
title = {Where has all the polarization gone?},
author = {E. Middelberg and A. L. Roy and U. Bach and D. C. Gabuzda and T. Beckert},
journal= {arXiv preprint arXiv:astro-ph/0309385},
year = {2007}
}
Comments
To be published in "Future Directions in High Resolution Astronomy" (Celebration of the 10th Anniversary of the Very Long Baseline Array), ASP Conference Series, 7 pages, 1 figure, needs newpasp.sty