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Lee Lab (Kavli IPMU)
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An observational cosmology lab that maps the distribution of gas and galaxies in the distant universe in three dimensions.
AboutAbout the lab
Mapping the cosmic web of the universe in three dimensions
The Lee Lab conducts research in observational cosmology, using observations to study how gas and galaxies are distributed in the distant universe.
The universe has a spider-web-like large-scale structure called the cosmic web, which reflects the primordial fluctuations that existed right after the Big Bang.
By studying its distribution, it is possible to place constraints on the parameters of fundamental physics of the universe.
In particular, the lab maps the era of "cosmic noon," about 10 billion years ago, in three dimensions using absorption lines from neutral hydrogen.
Key terms
- Cosmic web
- The large-scale structure of the universe, in which galaxies and gas are distributed in a spider-web-like network
- Absorption line
- A dark line that appears when light passing through gas along its path is weakened at specific wavelengths only. It reveals the amount and location of the gas
- Intergalactic medium
- Matter such as thin gas that fills the space between galaxies
ResearchResearch themes
The lab studies the large-scale distribution of gas and galaxies in the distant universe, aiming to constrain the parameters of fundamental physics and to elucidate the evolution of galaxies and baryons. Combining spectroscopic observations with simulations, it relies mainly on the Prime Focus Spectrograph (PFS) on the Subaru Telescope as its observational foundation.
*Illustrative image3D Maps of the Universe's Large-Scale Structure
For the era known as "cosmic noon," about 10 billion years ago, the lab maps the distribution of gas using 3D tomography based on absorption lines from neutral hydrogen. It is involved in observations with the Keck Telescope and in a survey project using the PFS spectrograph on the Subaru Telescope.
*Illustrative imageThe Intergalactic Medium and the Whereabouts of Baryons
The lab studies the cosmic web and the intergalactic medium using methods such as Lyα tomography and Bayesian inference. Using the dispersion measures of fast radio bursts (FRBs), it also traces the distribution of ordinary matter (baryons) lurking between and around galaxies.
MembersFaculty
- Associate ProfessorLee Khee-Gan
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: “Aerial Sunrise on Mauna Kea (gemini-20060131-summitpv)” Neelon Crawford - Polar Fine Arts/International Gemini Observatory/National Science Foundation / CC BY 4.0 (cropped)
- 3D Maps of the Universe's Large-Scale Structure: “Hubble ultra deep field” NASA and the European Space Agency / Public domain (cropped)
- The Intergalactic Medium and the Whereabouts of Baryons: “Subaru Telescope. Mauna Kea Summit ( )” Robert Linsdell from St. Andrews, Canada / CC BY 2.0 (cropped)
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