Optical circular polarization of blazar S4 0954+65 during high linear polarized states: letters to the editor

Optical circular polarization observations can directly test the particle composition in black hole jets. We report the first observations of the BL Lac-type object S4 0954+65 in high linear polarized states. While no circular polarization was detected, we were able to place upper limits of < 0.5...

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Main Authors:	Liodakis, Ioannis (Author) , Shablovinskaya, E. (Author) , Blinov, D. (Author) , Savchenko, S. S. (Author) , Malygin, E. (Author) , Kotov, S. (Author) , Kiehlmann, S. (Author) , Readhead, A. C. S. (Author) , Potter, S. B. (Author) , Rieger, Frank M. (Author) , Grishina, T. S. (Author) , Hagen-Thorn, V. A. (Author) , Kopatskaya, E. N. (Author) , Larionova, E. G. (Author) , Morozova, D. A. (Author) , Troitskiy, I. S. (Author) , Troitskaya, Y. V. (Author) , Vasilyev, A. A. (Author) , Zhovtan, A. V. (Author) , Borman, G. A. (Author)
Format:	Article (Journal) Editorial
Language:	English
Published:	December 2023
In:	Astronomy and astrophysics Year: 2023, Volume: 680, Pages: 1-4
ISSN:	1432-0746
DOI:	10.1051/0004-6361/202348214
Online Access:	Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202348214 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2023/12/aa48214-23/aa48214-23.html
Author Notes:	I. Liodakis, E. Shablovinskaya, D. Blinov, S.S. Savchenko, E. Malygin, S. Kotov, S. Kiehlmann, A.C.S. Readhead, S.B. Potter, F.M. Rieger, T.S. Grishina, V.A. Hagen-Thorn, E.N. Kopatskaya, E.G. Larionova, D.A. Morozova, I.S. Troitskiy, Y.V. Troitskaya, A.A. Vasilyev, A.V. Zhovtan, and G.A. Borman