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Gap-type Particle Acceleration in the Magnetospheres of Rotating Supermassive Black Holes

Katsoulakos, G., & Rieger, F. M. (2020). Gap-type Particle Acceleration in the Magnetospheres of Rotating Supermassive Black Holes. Astrophysical Journal, 895(2): 99. doi:10.3847/1538-4357/ab8fa1.

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Genre: Journal Article

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2005.05076.pdf (Preprint), 996KB
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Creators:
Katsoulakos, Grigorios1, Author
Rieger, Frank M.1, Author
Affiliations:
1Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society, ou_2074298

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract: The detection of rapidly variable gamma-ray emission in active galactic nuclei has generated renewed interest in magnetospheric particle acceleration and emission scenarios. In order to explore its potential, we study the possibility of steady gap acceleration around the null surface of a rotating black hole magnetosphere. We employ a simplified (1D) description along with the general relativistic expression of Gauss's law, and we assume that the gap is embedded in the radiation field of a radiatively inefficient accretion flow. The model is used to derive expressions for the radial distribution of the parallel electric field component, the electron and positron charge density, the particle Lorentz factor, and the number density of $\gamma$-ray photons. We integrate the set of equations numerically, imposing suitable boundary conditions. The results show that the existence of a steady gap solution for a relative high value of the global current is in principle possible if charge injection of both species is allowed at the boundaries. We present gap solutions for different choices of the global current and the accretion rate. When put in context, our results suggest that the variable very high energy $\gamma$-ray emission in M87 could be compatible with a magnetospheric origin.

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Dates: 2020-06-02
Publication Status: Published online
Pages: 20 pages, 11 figures; ApJ accepted; minor typos fixed to match published version
Publishing info: -
Rev. Type: -
Identifiers: arXiv: 2005.05076
DOI: 10.3847/1538-4357/ab8fa1
Degree: -

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### Source 1

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Title: Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 895 (2) Sequence Number: 99 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_2