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Space Physics (High-Energy Astronomy) (Uxg) Lab
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A lab that explores the extreme conditions of the universe with X-rays and gravitational waves.
AboutAbout the lab
Exploring the universe as an extreme laboratory through X-rays and gravitational waves
The Uxg Lab observes high-energy phenomena in the universe with X-rays and MeV gamma rays, and also works on detecting gravitational waves.
Using satellites and rockets, the lab studies galaxy clusters, black holes, stellar flares, and more.
The lab takes part in developing the XRISM satellite, which has the world's best X-ray spectroscopy capability, and the FOXSI rocket, and is also developing instruments for future observations.
In its gravitational wave research, the lab aims to detect gravitational waves produced in the era of inflation, immediately after the birth of the universe.
Key terms
- XRISM satellite
- A satellite with the world's best X-ray spectroscopy capability. It was launched in September 2023.
- Gravitational waves
- Waves observed in mergers of binary black holes and binary neutron stars. They arrive from the edge of the universe and are highly penetrating.
- Inflation
- An era thought to have occurred immediately after the birth of the universe (around 10^-35 seconds).
NewsLab news
A master's student won the Best Student Presentation Award at the UVSOR Symposium 2025
A doctoral student won the FY2025 (Reiwa 7) Nagoya University Academic Encouragement Award
A master's student won the Student Outstanding Presentation Award of the Physical Society of Japan
A doctoral student won the Outstanding Poster Award at Nagoya University's exchange event between companies and doctoral talent
A master's student won the Outstanding Student Presentation Award at the Japan Geoscience Union Meeting 2025
ResearchResearch themes
The universe is full of states that cannot be realized on Earth, such as temperatures above 100 million degrees and extreme gravity from which not even light can escape. The Uxg Lab investigates this "extreme laboratory" with X-rays and gravitational waves.
*Illustrative imageHigh-energy phenomena in the universe seen in X-rays
The lab studies high-energy phenomena in galaxy clusters, black holes, stellar flares, and more using X-rays, and researches the large-scale motion of hot gas, the creation and dispersal of heavy elements, and particle acceleration at shock waves. It is also developing instruments to be mounted on satellites and carrying out gamma-ray observations of thunderclouds.
*Illustrative imageExploring the beginning of the universe with gravitational waves
The lab is working to detect gravitational waves produced in the era of inflation, immediately after the birth of the universe (around 10^-35 seconds). It also does research to increase the information obtained from mergers of binary black holes and binary neutron stars, and is about to begin fundamental physics research using precision measurement of light.
MembersFaculty
The members of the Uxg Lab consist of faculty, postdoctoral researchers, technical assistants, a secretary, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorKazuhiro Nakazawa
- Associate ProfessorKeiko Kokeyama
- LecturerIkuyuki Mitsuishi
- LecturerKazunori Ishibashi
VoicesStudent voices
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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.
- Top image: “Chandra X-Ray Observatory in STS-93 Columbia's payload bay (MSFC-9904742)” NASA/KSC / Public domain (cropped)
- High-energy phenomena in the universe seen in X-rays: “Composite X-Ray Radio and Infrared of galaxy cluster CL J1001+0220” X-ray: NASA/CXC/Université Paris/T.Wang et al; Infrared: ESO/UltraVISTA; Radio: ESO/NAOJ/NRAO/ALMA / Public domain (cropped)
- Exploring the beginning of the universe with gravitational waves: “Laser Towards Milky Ways Centre” ESO/Yuri Beletsky (ybialets at eso.org) / CC BY 4.0 (cropped)
- Related lab (Space Physics (Infrared) (Uir) Lab): “Technicians check out the mounting structure of the infrared telescope installed in NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA) (ED )” NASA Armstrong Flight Research Center / NASA/Tony Landis / Public domain (cropped)
- Related lab (Astrophysics (A) Lab): “CSIRO ScienceImage 559 Radio Telescopes at the Australia Telescope Compact Array” division, CSIRO / CC BY 3.0 (cropped)
- Related lab (General Relativity and Quantum Cosmology (QG) Lab): “Binary Black Hole” Jeremy Schnittman / CC BY 4.0 (cropped)
- Related lab (Solar-Terrestrial Environment Physics (SST) Lab): “First GOES-17 SUVI Images Capture Solar Flare ( )” NOAA Satellites / Public domain (cropped)
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