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Yamaguchi (Hiro) Lab
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The lab studies hot plasma in the universe using both X-ray astronomy satellites and laboratory experiments.
AboutAbout the lab
Seeing the hottest places in the universe in X-rays.
The Yamaguchi Lab conducts observational research on high-energy astrophysical objects using X-ray astronomy satellites.
Its targets are objects with hot plasma exceeding millions of degrees, such as stellar flares, accretion disks around black holes, supernova remnants, and galaxy clusters.
X-rays from these objects do not reach the ground, so they are observed from outside the atmosphere by artificial satellites.
The lab also works on laboratory astrophysics, in which the same kind of hot plasma found in these objects is recreated and measured in the laboratory.
Key terms
- Plasma
- A state in which atoms are separated into nuclei and electrons, which fly around freely like a gas
- Supernova remnant
- An expanding mass of gas and shock waves left behind after a star explodes as a supernova
- X-ray spectroscopy
- A method that splits X-rays by wavelength and measures their intensity to determine the temperature and elemental abundances of the material emitting them
NewsLab news
A student received the Best Research Presentation Award
A paper on the supernova remnant DEM L71 was published in PASJ
A student received the Best Student Poster Award
A student received the 15th Outstanding Master's Thesis Award for Detector Development
ResearchResearch themes
The lab studies high-energy astrophysical objects with hot plasma through X-ray observations from satellites. Its motto is to stay faithful to fundamental physical laws rather than relying on existing models, and it is strong in plasma diagnostics based on precise analysis of X-ray spectroscopic data.
*Illustrative imageHigh-Energy Astronomy
The lab observes stellar flares, accretion disks around black holes, supernova remnants, galaxy clusters, and more, using astronomy satellites from around the world. It has investigated energy dissipation at shock waves in interstellar space and the mechanisms of nucleosynthesis in supernovae.
*Illustrative imageLaboratory Astrophysics
The lab produces, in the laboratory, the same kind of hot plasma found in high-energy astrophysical objects, and obtains atomic data from spectroscopic measurements of it. This work is carried out in collaboration with the National Institute for Fusion Science and the Max Planck Institute for Nuclear Physics in Germany.
*Illustrative imageX-ray Imaging and Spectroscopy Mission XRISM
XRISM is a satellite developed by the Institute of Space and Astronautical Science (ISAS) of JAXA in collaboration with NASA in the US and ESA in Europe. Its strength is ultra-high-precision X-ray spectroscopy with an X-ray microcalorimeter. The lab uses it to study the motion of plasma in galaxy clusters and the heating processes at shock waves in supernova remnants.
MembersFaculty
The Yamaguchi Lab consists of faculty members, Space and Aeronautics Project Researchers, and PhD, master's, and undergraduate students.As of 2026
- ProfessorHiroya Yamaguchi
- Assistant ProfessorYoshiaki Kanemaru
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Tycho-supernova-xray” NASA/CXC
（Smithsonian Institution 経由） / Public domain (cropped) - High-Energy Astronomy: “Chandra X-ray Image of the Fornax Cluster (2008-ngc1404-more-2 -)” NASA/CXC/Columbia U./C.Scharf et al. / Public domain (cropped)
- Laboratory Astrophysics: “Electron Beam Ion Trap ( )” National Institute of Standards and Technology / Public domain (cropped)
- X-ray Imaging and Spectroscopy Mission XRISM: “Unsmoothed X-ray image of the Perseus cluster (2000-perseus-more-2)” (Credit: NASA/IoA/A.Fabian et al.) / Public domain (cropped)
- Related lab (Sako Lab): “Cosmic Ray Station ( )” Alastair Rae from London, United Kingdom / CC BY-SA 2.0 (cropped)
- Related lab (High Energy Astrophysics Lab): “M87 jet” NASA and The Hubble Heritage Team (STScI/AURA) / Public domain (cropped)
- Related lab (Bamba Lab): “Supernova Remnant SN 1006” X-ray: NASA/CXC/Rutgers/G.Cassam-Chenaï, J.Hughes et al.; Radio: NRAO/AUI/NSF/GBT/VLA/Dyer, Maddalena & Cornwell; Optical: Middlebury College/F.Winkler, NOAO/AURA/NSF/CTIO Schmidt & DSS / CC BY 4.0 (cropped)
- Related lab (Yako Lab (CNS Experimental Nuclear Physics)): “RIKEN Superconducting Ring Cyclotron P4213478” Kestrel / CC BY-SA 4.0 (cropped)
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