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

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arxiv 2311.03450 v1 pith:UWW6HF5T submitted 2023-11-06 astro-ph.HE astro-ph.CO

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

I. Liodakis , E. Shablovinskaya , D. Blinov , S. S. Savchenko , E. Malygin , S. Kotov , S. Kiehlmann , A. C. S. Readhead
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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 G. A. Borman
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keywords circularpolarizationcompositionfieldmagneticmodelsobservationsoptical
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Optical circular polarization observations can directly test the particle composition in black holes jets. Here we report on 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 the 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 where 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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Circular polarization effects induced by photon-axion mixing in astrophysical environments

    astro-ph.HE 2026-06 unverdicted novelty 4.0

    Photon-axion mixing in magnetic fields induces circular polarization that constrains the axion-photon coupling to g_aγγ ≤ 5×10^{-12} GeV^{-1} for m_a ~10^{-16}--10^{-10} eV using blazar data, with peak sensitivity in ...

  2. Circular polarization effects induced by photon-axion mixing in astrophysical environments

    astro-ph.HE 2026-06 conditional novelty 4.0

    The paper derives analytic circular-polarization signals from photon-axion mixing and uses the blazar S4 0954+65 optical circular-polarization limit to bound g_aγγ around 10^-12 to 10^-11 GeV^-1 for ultralight axion masses.