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Kashikawa Lab
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Using the Subaru Telescope to peer into the distant universe, this lab studies the early universe.
AboutAbout the lab
Searching the distant sky for the first objects in the universe.
The Kashikawa Lab mainly uses the Subaru Telescope to conduct observational studies of distant objects and the early universe.
Key topics include distant galaxies, first-generation galaxies, first-generation black holes, and protoclusters.
The lab traces the period from the dark ages, when the universe was filled with neutral hydrogen, to the era when the first objects began ionizing the surrounding space.
The lab also investigates young structures before they grow into galaxy clusters, as well as the relationship between invisible dark matter and ordinary matter.
Key terms
- Cosmic reionization
- An event in the early universe in which the first objects were born and the neutral hydrogen surrounding them was ionized
- Protocluster
- A group of young galaxies still in the process of growing, which will later develop into a galaxy cluster
- Quasar
- An object that appears to shine intensely when a supermassive black hole swallows the matter around it
ResearchResearch themes
The lab conducts observational studies of distant objects and the early universe, using the Subaru Telescope as its main tool. It focuses on four central themes: cosmic reionization, structure formation in the early universe, first-generation black holes, and dark matter.
*Illustrative imageCosmic Reionization
After the Big Bang, during the dark ages when the universe was filled with neutral hydrogen, the first objects were born and began ionizing their surroundings. By observing large numbers of extremely distant galaxies, the lab aims to directly capture what this era was like.
*Illustrative imageStructure Formation in the Early Universe
Galaxies are distributed like a web, with galaxy clusters located where the filaments intersect. By discovering many young clusters from the past that are growing right now, the lab explores how these enormous structures came to be.
*Illustrative imageFirst-Generation Black Holes and Quasars
How the supermassive black holes at the centers of galaxies were born and grew remains a mystery. The lab searches for black holes in the early universe, using brightly shining quasars as clues.
*Illustrative imageDark Matter and Ordinary Matter
Through observations of distant galaxies and QSO absorption-line systems, the lab investigates how invisible dark matter and ordinary matter, such as gas and stars, have interacted to build the structure of the universe.
MembersFaculty
- ProfessorNobunari KashikawaPublications ↗
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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: “Subaru Telescope. Mauna Kea Summit ( )” Robert Linsdell / CC BY 2.0 (cropped)
- Cosmic Reionization: “Early Universe Crackled With Bursts of Star Formation, Webb Shows” NASA's James Webb Space Telescope / CC BY 2.0 (cropped)
- Structure Formation in the Early Universe: “New Hubble view of galaxy cluster Abell 1689” NASA, ESA, the Hubble Heritage Team (STScI/AURA), J. Blakeslee ほか
/ CC BY 4.0 (cropped) - First-Generation Black Holes and Quasars: “Artist’s impression of quasar J” NOIRLab/NSF/AURA/J. da Silva / CC BY 4.0 (cropped)
- Dark Matter and Ordinary Matter: “Hubble finds dark matter ring in galaxy cluster (heic0709b)” NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University) / Public domain (cropped)
- Related lab (嶋作研究室): “Webb's First Deep Field” NASA, ESA, CSA, and STScI / Public domain (cropped)
- Related lab (本原顕太郎研究室): “Hubble-ultra-deep-field-20091208-WFC3-IR-full” NASA / Public domain (cropped)
- Related lab (左近研究室): “Tarantula Nebula Spitzer 2 (Color Image) - PIA23646” NASA/JPL-Caltech / Public domain (cropped)
- Related lab (河野孝太郎研究室): “ALMA antennas on Chajnantor (malin-dsc0027)” ESO/C. Malin / CC BY 4.0 (cropped)
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