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Particle Acceleration in Collisionless Magnetically Arrested Disks.

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This study simulates black hole accretion, revealing magnetic flux eruptions drive particle acceleration and jet-disk mixing. These eruptions, linked to reconnection, are key to understanding high-energy particle generation in these systems.

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Area of Science:

  • Astrophysics
  • Plasma Physics
  • Computational Science

Background:

  • Black hole accretion disks are crucial for understanding energetic phenomena.
  • Magnetically arrested disks (MAD) are a proposed state for black hole accretion.
  • Simulating collisionless plasma dynamics in strong gravity is computationally challenging.

Purpose of the Study:

  • To present the first collisionless simulation of axisymmetric black hole accretion in a MAD state.
  • To investigate particle acceleration mechanisms within the black hole magnetosphere.
  • To study the interaction between the accretion flow and the relativistic jet.

Main Methods:

  • Employed first-principles general-relativistic particle-in-cell (PIC) methods.
  • Simulated a two-dimensional axisymmetric ion-electron plasma with pair creation.
  • Included realistic treatments of inverse Compton scattering and pair production.

Main Results:

  • Achieved a quasisteady accretion state with persistent magnetic flux eruptions.
  • Identified equatorial magnetic reconnection and spark gaps as sites of maximal particle acceleration.
  • Observed Kelvin-Helmholtz-like vortices at the jet-disk interface, enhancing plasma mixing.
  • Linked transient pair production after eruptions to highly accelerated particles.

Conclusions:

  • Magnetic flux eruptions are a primary driver of particle acceleration in MADs.
  • Reconnection events and associated spark gaps are critical for energizing particles.
  • Jet-disk interface mixing, facilitated by vortices, is significant for understanding accretion processes.