Hirotani, Kouichi 廣谷幸一

Visiting Associate Research Fellow

photo of Hirotani, Kouichi
Office: ASMAB 1218
Email: hirotani _replace_to_@_ asiaa.sinica.edu.tw

Research Interests

High Energy Astrophysics

Journal Papers affiliated with ASIAA(35)

  1. Hirotani K; Shang H; Krasnopolsky R; Nishikawa K, "Formation of Limb-brightened Radio Jets by Angle-dependent Energy Extraction from Rapidly Rotating Black Holes", ApJ: 965(1), id.50 (11 pp), Apr, 2024 [SCI] ( ADS | Fulltext )
  2. Hirotani K; Shang H; Krasnopolsky R; Nishikawa K-I, "Two-dimensional Particle-in-Cell simulations of axisymmetric black hole magnetospheres: angular dependence of the Blandford-Znajek flux", ApJ: 943(2), id.164 (19 pp.), Feb, 2023 [SCI] ( ADS | Fulltext )
  3. Hirotani K; Krasnopolsky R; Shang H; Nishikawa K-I; Watson M, "Two-dimensional Particle-in-Cell Simulations of Axisymmetric Black Hole Magnetospheres", ApJ: 908(1), id.88 (19pp), Feb, 2021 [SCI] ( ADS | Fulltext )
  4. Hirotani K, "Very High-Energy Emission from the Direct Vicinity of Rapidly Rotating Black Holes", Galaxies: 6(4), 122 (37 pp.), Dec, 2018 [SCI] ( ADS | Fulltext )
  5. Hirotani K; Pu H-Y; Outmani S; ...; Matsushita S; Kong AKH, "High-energy and Very High Energy Emission from Stellar-mass Black Holes Moving in Gaseous Clouds", ApJ: 867(2), id. 120 (13 pp.), Nov, 2018 [SCI] ( ADS | Fulltext )
  6. Hirotani K; Pu HY; Matsushita S, "Lightning black holes as unidentified TeV sources", JApA: 39(4), id. 50 (8 pp.), Aug, 2018 [SCI] ( ADS | Fulltext )
  7. Hirotani K; Pu H-Y; Lin LC-C; Kong AKH; Matsushita S; Asada K; et al, "Lepton Acceleration in the Vicinity of the Event Horizon: Very High Energy Emissions from Supermassive Black Holes", ApJ: 845(1), 77, Aug, 2017 [SCI] ( ADS | Fulltext )
  8. Hirotani K; Pu H-Y; Lin LC-C; Chang H-K;Inoue M; Kong AKH; Matsushita S; Tam P-HT, "Lepton acceleration in the vicinity of the event horizon: High-energy and Very-high-energy emissions from rotating black holes with various masses", ApJ: 833(2), 142, Dec, 2016 [SCI] ( ADS | Fulltext )
  9. Hirotani K; Pu H-Y, "Energetic Gamma Radiation from Rapidly Rotating Black Hole", ApJ: 818(1), 50, Feb, 2016 [SCI] ( ADS | Fulltext )
  10. Hirotani K, "Does a strong particle accelerator arise very close to the light cylinder in a pulsar magnetosphere?", MNRAS: 442(1), L43-L45, July, 2014 [SCI] ( ADS | Fulltext )
  11. Hirotani K, "Luminosity Evolution of Gamma-Ray Pulsars", ApJ: 766(2), 98, April 1, 2013 [SCI] ( ADS | Fulltext )
  12. Hirotani K, "Outer-gap versus Slot-gap Models for Pulsar High Energy Emissions: The Case of the Crab Pulsar", ApJ: 688(1), L25-L28, Nov 20, 2008 [SCI] ( ADS | Fulltext )
  13. Hirotani K, "High-energy Emission from Pulsar Outer Magnetospheres", ApJ: 662(2), 1173-1176, Jun 20, 2007 [SCI] ( ADS | Fulltext )
  14. Hirotani K, "Particle Accelerator in Pulsar Magnetospheres: Super Goldreich-Julian Current with Ion Emission from the Neutron Star Surface", ApJ: 652(2), 1475-1493, Dec 1, 2006 [SCI] ( ADS | Fulltext )
  15. Hirotani K, "High-energy Emission from Pulsar Magnetospheres", MPLA: 21(17), 1319-1337, Jun 7, 2006 [SCI] ( ADS | Fulltext )
  16. Meli A; Nishikawa K; Köhn C; Duţan I; Mizuno Y; Kobzar O; Macdonald N; Gómez JL; Hirotani K, "3D PIC Simulations for relativistic jets with a toroidal magnetic field", MNRAS: 519(4), 5410-5426, March, 2023 [SCI] ( ADS | Fulltext )
  17. MAGIC Collaboration; Acciari VA; Ansoldi S; Antonelli LA; ...; Hirotani K; et al., "Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV", A&A: 643, id.L14 (6pp), Nov, 2020 [SCI] ( ADS | Fulltext )
  18. Nishikawa K; Mizuno Y; Gómez JL;...; Hirotani K, "Rapid Particle Acceleration due to Recollimation Shocks and Turbulent Magnetic Fields in Injected Jets with Helical Magnetic Fields", MNRAS: 493(2), 2652-2658, Apr, 2020 [SCI] ( ADS | Fulltext )
  19. Song Y; Pu HY; Hirotani K; Matsushita S; et al., "Enhanced gamma radiation towards the rotation axis from the immediate vicinity of extremely rotating black holes", MNRAS: 471(1), L135-L139, Oct, 2017 [SCI] ( ADS | Fulltext )
  20. Lin L C-C; Pu H-Y; Hirotani K; Kong AKH; Matsushita S; Chang H-K; Inoue M; Tam P-HT, "Searching for High-energy, Horizon-scale Emissions from Galactic Black Hole Transients during Quiescence", ApJ: 845(1), 40, Aug 10, 2017 [SCI] ( ADS | Fulltext )
  21. Pu H-Y; Hirotani K; Mizuno Y; Chang H-K, "Two Types of Ergospheric Jets from Accreting Black Holes: The Dichotomy of Fanaroff-Riley Galaxies", ApJ, 2017, Submitted [SCI] ( ADS | Fulltext )
  22. Ansoldi S; Antonelli LA; Antoranz P; ...; Hirotani K; et al., "Teraelectronvolt pulsed emission from the Crab Pulsar detected by MAGIC", A&A: 585, A133, Jan, 2016 [SCI] ( ADS | Fulltext )
  23. Pu H-Y; Nakamura M; Hirotani K; Mizuno Y; Wu K; Asada K, "Steady General Relativistic Magnetohydrodynamic Inflow/Outflow Solution Along Large-Scale Magnetic Fields That Thread A Rotating Black Hole", ApJ: 801(1), 56, March, 2015 [SCI] ( ADS | Fulltext )
  24. Viganò D; Torres DF; Hirotani K; Pessah ME, "An assessment of the pulsar outer gap model - I. Assumptions, uncertainties, and implications on the gap size and the accelerating field", MNRAS: 447(3), 2631-2648, March 1, 2015 [SCI] ( ADS | Fulltext )
  25. Viganò D; Torres DF; Hirotani K; Pessah ME, "An assessment of the pulsar outer gap model - II. Implications for the predicted γ-ray spectra", MNRAS: 447(3), 2649-2657, March 1, 2015 [SCI] ( ADS | Fulltext )
  26. Viganò D; Torres DF; Hirotani K; Pessah ME, "Compact formulae, dynamics and radiation of charged particles under synchro-curvature losses", MNRAS: 447(2), 1164-1172, Feb 21, 2015 [SCI] ( ADS | Fulltext )
  27. Hirotani K, "Three-dimensional Non-vacuum Pulsar Outer-gap Model: Localized Acceleration Electric Field in the Higher Altitudes", ApJ: 798(2), L40, Jan, 2015 [SCI] ( ADS | Fulltext )
  28. Aleksić J; Ansoldi S; Antonelli LA; ...; Hirotani K; et al., "Detection of bridge emission above 50 GeV from the Crab pulsar with the MAGIC telescopes", A&A: 565, L12, May, 2014 [SCI] ( ADS | Fulltext )
  29. Pu H-Y; Hirotani K; Chang H-K, "Launching and Quenching of Black Hole Relativistic Jets at Low Accretion Rate", ApJ: 758(2), 113, Oct 20, 2012 [SCI] ( ADS | Fulltext )
  30. Aleksić J; ...; Hirotani K; et al., "Phase-resolved energy spectra of the Crab pulsar in the range of 50-400 GeV measured with the MAGIC telescopes", A&A: 540, A69, April, 2012 [SCI] ( ADS | Fulltext )
  31. Aleksić J;...; Hirotani K, "Observations of the Crab Pulsar between 25 and 100 GeV with the MAGIC I Telescope", ApJ: 742(1), 43, Nov 20, 2011 [SCI] ( ADS | Fulltext )
  32. Wang RB; Hirotani K, "Death Line of Gamma-Ray Pulsars with Outer Gaps", ApJ: 736(2), 127, Aug 1, 2011 [SCI] ( ADS | Fulltext )
  33. Hirotani K, "Pulsar Outer-gap Electrodynamics: Hardening of Spectral Shape in the Trailing Peak in the Gamma-Ray Light Curve", ApJ: 733(2), L49, June, 2011 [SCI] ( ADS | Fulltext )
  34. Albert J; Aliu E; Anderhub H; ...Hirotani K; ...; et al., "Constraints on the steady and pulsed very high energy gamma-ray emission from observations of PSR B1951+32/CTB 80 with the magic telescope", ApJ: 669(2), 1143-1149, Nov 10, 2007 [SCI] ( ADS | Fulltext )
  35. Takata J; Shibata S; Hirotani K; Chang H-K, "A two-dimensional electrodynamical outer gap model for γ-ray pulsars: γ-ray spectrum", MNRAS: 366(4), 1310-1328, Mar, 2006 [SCI] ( ADS | Fulltext )