A Caltech Library Service

Optical polarisation variability of narrow line Seyfert 1 galaxies

Angelakis, Emmanouil and Kiehlmann, S. and Myserlis, I. and Blinov, D. and Eggen, J. and Itoh, R. and Komossa, S. and Marchilli, N. and Zensus, J. A. (2018) Optical polarisation variability of narrow line Seyfert 1 galaxies. In: Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe - NLS1 Padova. Proceedings of Science. No.328. Sissa , Trieste, Italy, Art. No. 19.

[img] PDF - Published Version
Creative Commons Attribution Non-commercial No Derivatives.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Angelakis, Emmanouil0000-0001-7327-5441
Kiehlmann, S.0000-0001-6314-9177
Eggen, J.0000-0002-5059-4949
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. This conference has been organized with the support of the Department of Physics and Astronomy “Galileo Galilei”, the University of Padova, the National Institute of Astrophysics INAF, the Padova Planetarium, and the RadioNet consortium. RadioNet has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 730562. The RoboPol project is a collaboration between Caltech in the USA, MPIfR in Germany, Torun Centre for Astronomy in Poland, the University of Crete/FORTH in Greece, and IUCAA in India. Data from the Steward Observatory spectropolarimetric monitoring project were used. This program is supported by Fermi Guest Investigator grants NNX08AW56G, NNX09AU10G, NNX12AO93G, and NNX15AU81G. The authors wish to thank the internal MPIfR referee Dr N. MacDonald for the careful reading of the manuscript and the detailed and useful comments.
Funding AgencyGrant Number
University of PadovaUNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Padova PlanetariumUNSPECIFIED
RadioNet ConsortiumUNSPECIFIED
European Research Council (ERC)730562
Series Name:Proceedings of Science
Issue or Number:328
Record Number:CaltechAUTHORS:20180925-110306814
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89914
Deposited By: Tony Diaz
Deposited On:25 Sep 2018 21:41
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page