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Kohno Lab
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The lab uses millimeter and submillimeter observations to uncover how galaxies and supermassive black holes formed.
AboutAbout the lab
Exploring how galaxies formed, through millimeter and submillimeter observations.
The Kohno Lab uses millimeter and submillimeter observations to study how galaxies, the groups they form, and the massive black holes within them were born and have evolved.
The lab belongs to the Radio Astronomy Group at the Institute of Astronomy. Centered on ALMA, it also combines data from optical, infrared, and X-ray telescopes in its investigations.
The lab is also developing line intensity mapping, a new observational technique, along with the instruments and data analysis methods it requires.
Whether a student's focus is observation or instrument development, the lab's basic policy is for each person to pursue the research they want to do as thoroughly as possible.
Associate Professor Fumi Egusa, who belongs to the same group, studies how gas moves and how stars form within spiral and barred spiral galaxies.
Key terms
- Gravitational lensing
- A phenomenon in which the gravity of a foreground object bends the path of light, making a background object appear brighter and distorted
- Line intensity mapping
- An observational technique that, without distinguishing individual galaxies, maps the intensity of a specific emission line over a wide area of the sky
- Interstellar medium
- Gas and dust spread between stars. It is the raw material for forming new stars
NewsLab news
View More ↗ResearchResearch themes
The lab studies the mechanisms of galaxy formation and evolution through radio, millimeter, and submillimeter observations. Centered on ALMA, it uses data from telescopes in Japan and abroad, and also develops new observing instruments together with research institutions in Japan and overseas.
*Illustrative imageFinding distant galaxies with gravitational lensing
This research combines ALMA with the gravitational lensing effect to find distant galaxies and study their structure.
*Illustrative imageSupermassive black holes and galaxies
Through observations of radio galaxies, quasars, and similar objects, the lab investigates how the supermassive black hole at a galaxy's center and the galaxy itself influence each other.
*Illustrative imageLine intensity mapping
The lab has launched SUBLIME-TIFUUN, a research project that uses millimeter and submillimeter line intensity mapping to probe star-formation activity and the distribution of dark matter during the epoch of reionization.
*Illustrative imageGas in spiral and barred spiral galaxies
The lab studies how the interstellar medium in spiral and barred spiral galaxies is distributed and how it moves (its dynamics). Research targets include the interstellar gas of the barred spiral galaxy M83 and fast-moving molecular clouds.
MembersFaculty
The members of the Radio Astronomy Group consist of faculty, project researchers, doctoral and master's students, and visiting collaborative researchers.As of 2026
- ProfessorKotaro KohnoPublications ↗
- Associate ProfessorFumi Egusa
- Assistant ProfessorKana Morokuma
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Kashikawa LabFaculty of Science, Department of AstronomyEarly universe and galaxy astronomyThe information on this page is compiled by the LabLog team from the lab's public information and interviews. For corrections or removal requests, please contact LabLog, not the lab.
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: “ALMA antennas on Chajnantor (malin-dsc0027)” ESO/C. Malin / CC BY 4.0 (cropped)
- Finding distant galaxies with gravitational lensing: “ALMA image of the gravitationally lensed galaxy SDP.81.” ALMA (NRAO/ESO/NAOJ); B. Saxton NRAO/AUI/NSF / CC BY 4.0 (cropped)
- Supermassive black holes and galaxies: “A Multi-Wavelength View of Radio Galaxy Hercules A” NASA, ESA, S. Baum and C. O'Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA) / CC BY 3.0 (cropped)
- Line intensity mapping: “Atacama Submillimeter Telescope Experiment 01” Denys (fr) / CC BY 3.0 (cropped)
- Gas in spiral and barred spiral galaxies: “Hero-64-pixel-array-superconducting-nanowire-single-photon-detector-b” NASA/JPL-Caltech; Text by Dr. Warren Holmes / Public domain (cropped)
- Related lab (泉研究室): “Artist’s impression of the active galactic nucleus of Messier 77 (eso2203d)” ESO/M. Kornmesser and L. Calçada / CC BY 4.0 (cropped)
- Related lab (電波天文学グループ（江草研究室）
): “M83 - Southern Pinwheel” (Credit) ESO / CC BY 4.0 (cropped) - Related lab (戸谷研究室): “Cosmic web” Volker Springel / Max Planck Institute For Astrophysics / CC BY-SA 4.0 (cropped)
- Related lab (柏川研究室): “Subaru Telescope. Mauna Kea Summit ( )” Robert Linsdell / CC BY 2.0 (cropped)
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