High-Energy Astrophysics Lab

From the extreme environments around black holes to the radiation environment on the lunar surface — we tackle the mysteries of the high-energy universe through theory and multi-messenger observations (X-rays, MeV gamma rays, radio, neutrinos, and gravitational waves).
Credit: RIKEN

Research

From fundamental astrophysics to applied radiation science.

01 — FUNDAMENTAL

Fundamental Astrophysics

Uncovering the physics of the high-energy universe — black holes and MeV gamma rays — through theory and multi-messenger observations.

Black Hole Astrophysics

Magnetic field measurements and origin of AGN coronae, jet launching, accretion physics, and extreme physics near the event horizon.

AGN coronae X-ray polarimetry ALMA +1 more

High-Energy Astrophysics (MeV)

Pioneering MeV gamma-ray astronomy and multi-messenger studies.

GRAMS neutrinos blazars
02 — APPLIED

Applied High-Energy and Radiation Studies

Applying our expertise in high-energy astrophysics to real-world radiation challenges of the space age.

Lunar Radiation Environment

Understanding and forecasting the cosmic-ray and radiation environment on the lunar surface for the era of human lunar activity.

cosmic rays solar energetic particles Artemis

News

Press release: Signatures of Lense-Thirring precession around a black hole

Shibaura Institute of Technology issued a press release on our XRISM and NuSTAR study capturing signs of general-relativistic precession of the inner accretion disk (Kawamuro et al.).

Lab website launched

The website of the Inoue High-Energy Astrophysics Lab is now online.

New research grant awarded

Awarded a JSPS Kakenhi Challenging Research (Exploratory) grant.

Paper on XRISM time-resolved Fe K-alpha spectroscopy of NGC 4395 accepted by ApJ (Kawamuro et al.)

Probing the variable inner disk of an AGN with XRISM, with signatures of Lense-Thirring precession.

Paper led by PhD student Nobuyuki Sakai accepted by ApJ

Revisiting AGN disk winds as an origin of the cosmic gamma-ray and neutrino backgrounds.

Recent Publications
  • Xue, R., Inoue, Y., Wang, Z., Liao, N., Xiong, D. (2026). Locating the Production Sites of High-Energy Neutrinos in Blazar Jets. arXiv e-prints, arXiv:2606.02024. ADS / arXiv / DOI
  • PLUS Science Team, Baba, S., Belli, S., Benotto, P., Delvecchio, I., et al. (2026). GREX-PLUS Science Book v2. arXiv e-prints, arXiv:2606.05237. ADS / arXiv / DOI
  • Sakai, N., Inoue, Y., Owen, E. R. (2026). Revisiting Disk Winds in Active Galactic Nuclei as an Origin of Cosmic Gamma-ray and Neutrino Backgrounds. arXiv e-prints, arXiv:2606.17490. ADS / arXiv / DOI
  • Kawamuro, T., Yamada, S., Noda, H., Inoue, Y., Ogawa, S., et al. (2026). XRISM Time-resolved Fe K$α$ Spectroscopy of NGC 4395: Time-variable Inner-disk Emission. arXiv e-prints, arXiv:2606.21180. ADS / arXiv / DOI
  • Komugi, S., Saito, T., Michiyama, T., Inoue, Y., Nakanishi, K., et al. (2026). An Active Galactic Nucleus in the Antennae Galaxies?. The Astrophysical Journal 1004, 126. ADS / arXiv / DOI

All publications →

Join Us

We are recruiting graduate students (MSc/PhD), postdocs, and undergraduates. Black holes, gamma rays, neutrinos, or the Moon — if any of these excites you, get in touch.