How Spatially Resolved Polarimetry Informs Black Hole Accretion Flow Models

Angelo Ricarte; Daniel C. M. Palumbo; Michael D. Johnson; Razieh Emami; Yuri Y. Kovalev

How Spatially Resolved Polarimetry Informs Black Hole Accretion Flow Models

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arxiv 2211.03907 v1 pith:HPQIC7F3 submitted 2022-11-07 astro-ph.HE

Angelo Ricarte , Michael D. Johnson , Yuri Y. Kovalev , Daniel C. M. Palumbo , Razieh Emami This is my paper · ORCID

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The Event Horizon Telescope (EHT) Collaboration has successfully produced images of two supermassive black holes, enabling novel tests of black holes and their accretion flows on horizon scales. The EHT has so far published total intensity and linear polarization images, while upcoming images may include circular polarization, rotation measure, and spectral index, each of which reveals different aspects of the plasma and space-time. The next-generation EHT (ngEHT) will greatly enhance these studies through wider recorded bandwidths and additional stations, leading to greater signal-to-noise, orders of magnitude improvement in dynamic range, multi-frequency observations, and horizon-scale movies. In this paper, we review how each of these different observables informs us about the underlying properties of the plasma and the spacetime, and we discuss why polarimetric studies are well-suited to measurements with sparse, long-baseline coverage.

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Semi-analytical Study on the Polarized Images of Black Hole due to Frame Dragging
gr-qc 2025-08 unverdicted novelty 5.0 of 10

Frame dragging flips an initially retrograde equatorial flow around a Kerr black hole, and the polarized image shows three distinct critical locations whose spatial hierarchy is derived analytically for an on-axis observer.

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