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Lightning black holes in dense molecular clouds
Luminosity evolution of pulsar outer magnetospheric accelerators as a function of neutron star spin down luminosity.
Schematic picture (side view) of a pulsar magnetosphere.
Spectral energy distribution of pulsed emission from a middle-aged pulsar B1951+32
Death Line of Gamma-ray Pulsars with Outer Gaps
Pulsed Gamma-Ray Emission from the Crab Pulsar
Spectral Hardening in the Trailing Peak of Gamma-ray Pulsar Light Curve
Spectral Hardening in the Trailing Peak of Gamma-ray Pulsar Light Curve
Pulsed Gamma-Ray Emission from the Crab Pulsar
Death Line of Gamma-ray Pulsars with Outer Gaps
Hirotani, Kouichi
Visiting Associate Research Fellow
photo of Hirotani, Kouichi
Office: ASMAB 1218
TEL: +886-2-2366-5406
FAX: +886-2-2367-7849
Email: hirotani_replace2@_asiaa.sinica.edu.tw

Research Interests

High Energy Astrophysics

Journal Papers affiliated with ASIAA

  1. 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 )
  2. 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 )
  3. 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 )
  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. Lin LC-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 )
  9. 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 )
  10. 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 )
  11. 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 )
  12. Hirotani K; Pu H-Y, "Energetic Gamma Radiation from Rapidly Rotating Black Hole" , ApJ: 818(1), 50, Feb, 2016 [SCI] ( ADS | Fulltext )
  13. 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 )
  14. 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 )
  15. 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 )
  16. 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 )
  17. 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 )
  18. 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 )
  19. 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 )
  20. 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 )
  21. Hirotani K, "Luminosity Evolution of Gamma-Ray Pulsars" , ApJ: 766(2), 98, April 1, 2013 [SCI] ( ADS | Fulltext )
  22. 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 )
  23. 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 )
  24. 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 )
  25. 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 )
  26. Wang RB; Hirotani K, "Death Line of Gamma-Ray Pulsars with Outer Gaps" , ApJ: 736(2), 127, Aug 1, 2011 [SCI] ( ADS | Fulltext )
  27. 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 )
  28. 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 )
  29. Hirotani K, "High-energy Emission from Pulsar Outer Magnetospheres" , ApJ: 662(2), 1173-1176, Jun 20, 2007 [SCI] ( ADS | Fulltext )
  30. Hirotani K, "High-energy Emission from Pulsar Magnetospheres" , MPLA: 21(17), 1319-1337, Jun 7, 2006 [SCI] ( ADS | Fulltext )
  31. 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 )
  32. Takata J; Shibata S; Hirotani K; Chang H-K, "A two-dimensional electrodynamical outer gap model for gamma-ray pulsars: gamma-ray spectrum" , MNRAS: 366(4), 1310-1328, Mar, 2006 [SCI] ( ADS | Fulltext )
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