Researcher
Satoshi Yamada
Assistant ProfessorAdvanced Basic Science
- Mentor Information
- Associate Professor
- Hirofumi Noda (Graduate School of Science)
| Research Fields | Multiwavelength Astronomy |
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| Research Subjects |
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| Academic Society Membership | Astronomical Society of Japan |
| Research Outline | |
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Why do black holes (“BHs”) exist in the universe? The latest astronomical satellites and large telescopes suggest that BHs are key players in the form of cosmic structures. For example, massive BHs, which are strong gravitational sources, are usually found at the centers of galaxies, and the BH mass is strongly linked to the structure of galaxies and galaxy clusters. Surprisingly, BHs give the impression of swallowing the surrounding gas but the gravitational energy of the gas is converted into heat and motion, resulting in “BH winds” that blow the gas away. Thus, BHs are expected to cause material circulation that collects and resupplies interstellar gas, acting like the heart of a galaxy or galaxy cluster. The purpose of my research is to reveal the whole picture of the motion (mass and velocity) and components (abundance) of matter circulated by BHs and to unravel the relationship between BHs and the birth of mankind. The XRISM satellite was launched in September 2023 and is capable of precise X-ray spectroscopy with a wavelength resolution about 30 times higher than that of previous instruments. The gas moving away from the BH gradually decreases in temperature and shines at different wavelengths, allowing us to study its overall structure using multiwavelength telescopes. XRISM will also resolve the abundance of gases in various regions and the origin of the materials in the solar systems. Finally, I will work to understand the role of BHs in the birth of galaxies, galaxy clusters, the solar system, and us. |
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