The region within a radius of approximately 200 parsecs from the Galactic Center is known as the Central Molecular Zone (CMZ). This area is a dense concentration of molecular gas that is hotter, denser, and more turbulent than the gas in the galactic disk. The CMZ contains a large number...
Dark matter (DM) is a mysterious energy component of our Universe which occupies about a quarter of its total energy density. The existence of DM is necessary for realizing our visible world, however, the detailed properties of DM are still unknown. In this talk, I will explain the motivation and...
Supermassive black holes (SMBHs), with masses ranging from 10^6 to 10^10 solar masses (Msun), are known to exist ubiquitously at the centres of galaxies. How such massive objects formed remains a major open question in astrophysics. Recent observations with the James Webb Space Telescope (JWST) have revealed SMBHs with masses...
We present 12CO(J = 1 – 0) mapping observations over ∼1/2 of the optical disk of 12 nearby galaxies from the Fundamental CO 1–0 Transition Survey of nearby galaxies (FACTS), using the ALMA Total Power array. Variations in the 12CO(J = 2 − 1)/12CO(J = 1 − 0) line ratio...
Carbon chain molecules, which consist of a series of carbon atoms, are molecules unique to interstellar space. Of the approximately 320 types of interstellar molecules discovered to date, approximately 40% are classified as carbon chain molecules. The chemistry of carbon chain molecules has been studied in low-mass star-forming regions in...
The region within a radius of approximately 200 parsecs from the Galactic Center is known as the Central Molecular Zone (CMZ). This area is a dense concentration of molecular gas that is hotter, denser, and more turbulent than the gas in the galactic disk. The CMZ contains a large number...
September 2025 15 : 30 Galactic center, molecular clouds, and black holes
Dark matter (DM) is a mysterious energy component of our Universe which occupies about a quarter of its total energy density. The existence of DM is necessary for realizing our visible world, however, the detailed properties of DM are still unknown. In this talk, I will explain the motivation and...
July 2025 15 : 10 dark matter, high-energy astrophysics, and semi-analytic models
Supermassive black holes (SMBHs), with masses ranging from 10^6 to 10^10 solar masses (Msun), are known to exist ubiquitously at the centres of galaxies. How such massive objects formed remains a major open question in astrophysics. Recent observations with the James Webb Space Telescope (JWST) have revealed SMBHs with masses...
June 2025 15 : 10 black holes, early universe, and cosmological simulations
We present 12CO(J = 1 – 0) mapping observations over ∼1/2 of the optical disk of 12 nearby galaxies from the Fundamental CO 1–0 Transition Survey of nearby galaxies (FACTS), using the ALMA Total Power array. Variations in the 12CO(J = 2 − 1)/12CO(J = 1 − 0) line ratio...
May 2025 15 : 30 ALMA, molecular gas, and AGN feedback
Carbon chain molecules, which consist of a series of carbon atoms, are molecules unique to interstellar space. Of the approximately 320 types of interstellar molecules discovered to date, approximately 40% are classified as carbon chain molecules. The chemistry of carbon chain molecules has been studied in low-mass star-forming regions in...
April 2025 15 : 30 Astrochemistry, ALMA, and Nobeyama 45m radio telescope
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