Current Closure and Gamma-Ray Signatures of Spark-Gap and Current-Sheet Activities in Radiative Black Hole Magnetospheres
Abstract
We investigate the evolution of an axisymmetric black hole magnetosphere using general relativistic particle-in-cell simulations, focusing on its global current structure, variability, and radiative effects. We include inverse-Compton (IC) scattering of ambient photons and subsequent two-photon pair production, and compare simulations with and without synchrotron-curvature (SC) radiation reaction. Starting from an axisymmetric vertical magnetic field, the system develops a polar spark gap and a variable equatorial current sheet that together sustain the global poloidal current. For the parameters explored in this study, we observe that the spark gap oscillates upon the onset of SC cooling, whereas the current sheet is less sensitive to radiative cooling. Time-dependent electric fields in the return-current layer trigger magnetic-field rearrangement followed by magnetic reconnection. Cross-correlation analysis finds no significant correlation between the two regions' variability, suggesting dynamical independence. We further perform post-processing ray-tracing calculations to evaluate the radiative efficiencies of the IC and SC processes. High-energy particles dominate the bolometric luminosity, which reaches up to 1 percent of the Blandford-Znajek luminosity for SC emission and 0.1 percent for IC emission. The relative IC luminosity to SC is higher at lower viewing angles because particle momenta are more anisotropic near the pole than near the equator, due to efficient acceleration along the local magnetic field lines. Together with energetic estimates, these results suggest that both regions can contribute to high-energy emission in active galactic nuclei, with spark-gap photons reaching the sub-TeV regime.
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BibTeX
@misc{kin2026current,
title = {{Current Closure and Gamma-Ray Signatures of Spark-Gap and Current-Sheet Activities in Radiative Black Hole Magnetospheres}},
author = {Koki Kin and Shota Kisaka and Kenji Toma and John M. Mehlhaff and Benoît Cerutti},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.10428},
eprint = {2611.10428},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.10428},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Current Closure and Gamma-Ray Signatures of Spark-Gap and Current-Sheet Activities in Radiative Black Hole Magnetospheres
AU - Koki Kin
AU - Shota Kisaka
AU - Kenji Toma
AU - John M. Mehlhaff
AU - Benoît Cerutti
PY - 2026
DA - 2026/11/07
PB - arXiv
DO - 10.48550/arxiv.2611.10428
UR - https://arxiv.org/abs/2611.10428
AB - We investigate the evolution of an axisymmetric black hole magnetosphere using general relativistic particle-in-cell simulations, focusing on its global current structure, variability, and radiative effects. We include inverse-Compton (IC) scattering of ambient photons and subsequent two-photon pair production, and compare simulations with and without synchrotron-curvature (SC) radiation reaction. Starting from an axisymmetric vertical magnetic field, the system develops a polar spark gap and a variable equatorial current sheet that together sustain the global poloidal current. For the parameters explored in this study, we observe that the spark gap oscillates upon the onset of SC cooling, whereas the current sheet is less sensitive to radiative cooling. Time-dependent electric fields in the return-current layer trigger magnetic-field rearrangement followed by magnetic reconnection. Cross-correlation analysis finds no significant correlation between the two regions' variability, suggesting dynamical independence. We further perform post-processing ray-tracing calculations to evaluate the radiative efficiencies of the IC and SC processes. High-energy particles dominate the bolometric luminosity, which reaches up to 1 percent of the Blandford-Znajek luminosity for SC emission and 0.1 percent for IC emission. The relative IC luminosity to SC is higher at lower viewing angles because particle momenta are more anisotropic near the pole than near the equator, due to efficient acceleration along the local magnetic field lines. Together with energetic estimates, these results suggest that both regions can contribute to high-energy emission in active galactic nuclei, with spark-gap photons reaching the sub-TeV regime.
ER -