Izumi, Takuma - Astronomical Science Program, SOKENDAI

Associate Professor Izumi, Takuma

Radio Astronomy, Active Galactic Nucleus (AGN), Supermassive Black Hole, Galaxy Evolution

I mainly utilizes ALMA observations of cold interstellar medium (ISM) to study the close environment to supermassive black holes and the properties of their host galaxies over the cosmic time, focusing on the (1) "co-evolution" of galaxies and the supermassive black holes lurking at their centers, as well as (2) the "growth mechanism of supermassive black holes." Regarding (1), I am actively working in an international collaboration that utilizes the large-scale imaging survey of Subaru Hyper Suprime-Cam data, and am leveraging JWST observations, to advance the study of high-redshift and low-luminosity quasar host galaxies. For (2), cooperation with theoretical/observational research groups both domestically and internationally is ongoing, conducting investigations of the physical, chemical, and dynamical properties of the ISM around the galactic center using high-resolution observations.

“Supermassive black hole feeding and feedback observed on subparsec scales”, Izumi et al. 2023, Science, 382, 554
“Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIII. Large-scale Feedback and Star Formation in a Low-luminosity Quasar at z = 7.07 on the Local Black Hole to Host Mass Relation”, Izumi et al. 2021, ApJ, 914, 36
“ALMA Observations of Multiple CO and C Lines toward the Active Galactic Nucleus of NGC 7469: An X-Ray-dominated Region Caught in the Act”, Izumi et al. 2020, ApJ, 898, 75
“Circumnuclear Multiphase Gas in the Circinus Galaxy. II. The Molecular and Atomic Obscuring Structures Revealed with ALMA”, Izumi et al. 2018, ApJ, 867, 48
“Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). III. Star formation properties of the host galaxies at z ≳ 6 studied with ALMA”, Izumi et al. 2018, PASJ, 70, 36
There are other 12 PI papers and 87 co-I papers (as of 2024 Mar).

NAOJ Young Researcher Award (2023)
Springer Theses Award (2017)
Research Encouragement Award from The University of Tokyo, School of Science (2014)
The University of Tokyo President Award (2014)
Asia-Pacific Radio Science Conference Student Paper Competition 1st prize (2013)

Part-time lecturer in Keio University
Visiting lecture in elementary/junior-high schools (~3-4 schools/yr)
Outreach activity (~5 lectures /yr in, e.g., culture center, science lab, schools)
Interviews in TV shows, articles, news
PI press-releases