Evidence of Complex B-field Structures in the ICM surrounding Cygnus A
Abstract
A new high sensitivity polarization study of Cygnus A using 2-18 GHz JVLA data shows significant depolarization below 6 GHz with 0.75'' (750 pc) resolution, as well as complicated polarization structures. Our preliminary analysis indicates multi-scale B-fields on scales > 120 kpc and < 300 pc. There is a strong evidence that the dominant rotation measures (thousands rad/m/m) are due to large-scale B-fields in the ambient ICM, but it is still unclear where the small-scales originate and their effect on the observation. We show, however, that the observed polarization structures may result from beam depolarization. We present this ongoing work.
- Publication:
-
The 34th Annual New Mexico Symposium
- Pub Date:
- November 2018
- Bibcode:
- 2018anms.conf....6S