2023A&A...680L..11L

Query : 2023A&A...680L..11L

2023A&A...680L..11L - Astronomy and Astrophysics, volume 680L11 (2023/12-1)

Optical circular polarization of blazar S4 0954+65 during high linear polarized states.

LIODAKIS I., SHABLOVINSKAYA E., BLINOV D., SAVCHENKO S.S., MALYGIN E., KOTOV S., KIEHLMANN S., READHEAD A.C.S., POTTER S.B., RIEGER F.M., GRISHINA T.S., HAGEN-THORN V.A., KOPATSKAYA E.N., LARIONOVA E.G., MOROZOVA D.A., TROITSKIY I.S., TROITSKAYA Y.V., VASILYEV A.A., ZHOVTAN A.V. and BORMAN G.A.

Abstract (from CDS):

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% at 99.7% confidence. Using a simple model and our novel optical circular polarization observations, we can constrain the allowed parameter space for the magnetic field strength and composition of the emitting particles. Our results favor models that require magnetic field strengths of only a few Gauss and models in which the jet composition is dominated by electron-positron pairs. We discuss our findings in the context of typical magnetic field strength requirements for blazar emission models.

Abstract Copyright: © The Authors 2023

Journal keyword(s): galaxies: jets - polarization - black hole physics - galaxies: active - BL Lacertae objects: individual: s4 0954+65 - relativistic processes

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PMN J0509+0541 BLL 05 09 25.9644373872 +05 41 35.333820420 15.32 14.95 14.78 15.12   ~ 589 2
2 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 771 1
3 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
4 QSO B1256-229 BLL 12 59 08.46204170 -23 10 38.6543799   18.0   15.9   ~ 57 1
5 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1409 1
6 QSO B2155-152 Bla 21 58 06.28188411 -15 01 09.3284729   18.63 18.30 17.79   ~ 355 1

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