Optical polarisation variability of narrow line Seyfert 1 galaxies
E. Angelakis*, S. Kiehlmann, I. Myserlis, D.A. Blinov, J. Eggen, R. Itoh, S. Komossa, N. Marchilli and A. Zensus
*: corresponding author
Full text: pdf
Pre-published on: July 05, 2018
Published on: December 21, 2018
Abstract
We have monitored the $R$-band optical linear polarisation of ten jetted NLSy1 galaxies with the aim to quantify their variability and search for candidate long rotation of the polarisation plane. In all cases for which adequate datasets are available we observe significant variability of both the polarisation fraction and angle. In the best-sampled cases we identify candidate long rotations of the polarisation plane. We present an approach that assesses the probability that the observed phenomenology is the result of pure noise. We conclude that although this possibility cannot be excluded it is much more likely that the EVPA undergoes an intrinsic evolution. We compute the most probable parameters of the intrinsic event which forecasts events consistent with the observations. In one case we find that the EVPA shows a preferred direction which, however, does not imply any dominance of a toroidal or poloidal component of the magnetic field at those scales.
DOI: https://doi.org/10.22323/1.328.0019
How to cite

Metadata are provided both in article format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in proceeding format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.