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Synthetic Images of Magnetospheric Reconnection-Powered Radiation around Supermassive Black Holes

Abstract : Accreting supermassive black holes can now be observed at the event-horizon scale at millimeter wavelengths. Current predictions for the image rely on hypotheses (fluid modeling, thermal electrons) which might not always hold in the vicinity of the black hole, so that a full kinetic treatment is in order. In this Letter, we describe the first 3D global general-relativistic particle-in-cell simulation of a black-hole magnetosphere. The system displays a persistent equatorial current sheet. Synthetic radio images are computed by ray-tracing synchrotron emission from nonthermal particles accelerated in this current sheet by magnetic reconnection. We identify several time-dependent features of the image at moderate viewing angles: a variable radius of the ring, and hot spots moving along it. In this regime, our model predicts that most of the flux of the image lies inside the critical curve. These results could help promote understanding of future observations of black-hole magnetospheres at improved temporal and spatial resolution.
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https://hal-insu.archives-ouvertes.fr/insu-03860254
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, November 18, 2022 - 3:43:30 PM
Last modification on : Sunday, November 20, 2022 - 3:05:01 AM

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Benjamin Crinquand, Benoît Cerutti, Guillaume Dubus, Kyle Parfrey, Alexander Philippov. Synthetic Images of Magnetospheric Reconnection-Powered Radiation around Supermassive Black Holes. Physical Review Letters, 2022, 129, ⟨10.1103/PhysRevLett.129.205101⟩. ⟨insu-03860254⟩

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