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    Collisionless Accretion onto Black Holes: Dynamics and Flares

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    Authors
    Galishnikova, A.
    Philippov, A.
    Quataert, E.
    Bacchini, F.
    Parfrey, K.
    Ripperda, B.
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    Discipline
    Physical sciences
    Subject
    Classical black holes
    Space & astrophysical plasma
    Accretion disk & black-hole plasma
    Astrophysical jets Relativistic plasmas
    Particle-in-cell methods
    Relativistic magnetohydrodynamics
    Plasma Physics
    Gravitation
    Cosmology & Astrophysics
    Audience
    Scientific
    Date
    2023
    Metadata
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    Description
    We study the accretion of collisionless plasma onto a rotating black hole from first principles using axisymmetric general-relativistic particle-in-cell simulations. We carry out a side-by-side comparison of these results to analogous general-relativistic magnetohydrodynamic simulations. Although there are many similarities in the overall flow dynamics, three key differences between the kinetic and fluid simulations are identified. Magnetic reconnection is more efficient, and rapidly accelerates a nonthermal particle population, in our kinetic approach. In addition, the plasma in the kinetic simulations develops significant departures from thermal equilibrium, including pressure anisotropy that excites kinetic-scale instabilities, and a large field-aligned heat flux near the horizon that approaches the free-streaming value. We discuss the implications of our results for modeling event-horizon scale observations of Sgr A* and M87 by GRAVITY and the Event Horizon Telescope.
    Citation
    Galishnikova, A.; Philippov, A.; Quataert, E.; Bacchini, F.; Parfrey, K.; Ripperda, B. (2023). Collisionless Accretion onto Black Holes: Dynamics and Flares. , Physical Review Letters, Vol. 130, Issue 11, A115201, DOI: 10.1103/PhysRevLett.130.115201.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/10824
    doi: http://dx.doi.org/10.1103/PhysRevLett.130.115201
    scopus:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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