3 papers
astro-ph.HE2025
Galactic Isolated Stellar-Mass Black Holes with the Magnetospheric Spark Gap as Possible GeV-TeV Gamma-ray Unidentified Sources
Koki Kin, Riku Kuze, Shigeo S. Kimura
Billions of isolated stellar-mass black holes (IBHs) are thought to wander through the interstellar medium (ISM) in the Galaxy, yet only one has been detected. IBHs embedded in ISM…
astro-ph.HE2024
Isolated Black Holes as Potential PeVatrons and Ultrahigh-energy Gamma-ray Sources
Shigeo S. Kimura, Kengo Tomida, Masato I. N. Kobayashi +2
The origin of PeV cosmic rays is a long-standing mystery, and ultrahigh-energy gamma-ray observations would play a crucial role in identifying it. Recently, LHAASO reported the dis…
astro-ph.HE2023
1D GRPIC Simulations of Stellar-Mass Black Hole Magnetospheres: Semi-Analytic Model of Gamma-Rays from Gaps
Koki Kin, Shota Kisaka, Kenji Toma +2
In the absence of a sufficient amount of plasma injection into the black hole (BH) magnetosphere, the force-free state of the magnetosphere cannot be maintained, leading to the eme…