Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae

Grošelj, Daniel; Hakobyan, Hayk; Beloborodov, Andrei M.; Sironi, Lorenzo; Philippov, Alexander

doi:10.1103/physrevlett.132.085202

Title: Radiative Particle-in-Cell Simulations of Turbulent Comptonization in Magnetized Black-Hole Coronae

Journal Article · 22 February 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.132.085202 · OSTI ID:2311131

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KU Leuven (Belgium); Columbia University, New York, NY (United States); Columbia University
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Columbia University, New York, NY (United States)
Columbia University, New York, NY (United States); Max Planck Institute for Astrophysics, Garching (Germany)
Columbia University, New York, NY (United States)
University of Maryland, College Park, MD (United States)

We report results from the first radiative particle-in-cell simulations of strong Alfvénic turbulence in plasmas of moderate optical depth. The simulations are performed in a local 3D periodic box and self-consistently follow the evolution of radiation as it interacts with a turbulent electron-positron plasma via Compton scattering. We focus on the conditions expected in magnetized coronae of accreting black holes and obtain an emission spectrum consistent with the observed hard state of Cyg X-1. Most of the turbulence power is transferred directly to the photons via bulk Comptonization, shaping the peak of the emission around 100 keV. The rest is released into nonthermal particles, which generate the MeV spectral tail. As a result, the method presented here shows promising potential for ab initio modeling of various astrophysical sources and opens a window into a new regime of kinetic plasma turbulence.

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Research Organization:: Columbia University, New York, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Simons Foundation

Grant/Contract Number:: SC0014664; AC02-06CH11357

OSTI ID:: 2311131

Alternate ID(s):: OSTI ID: 2474410

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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