Among the most energetic processes in the Universe, Active Galactic Nuclei (AGN) have been found throughout cosmic history; powered by a central Supermassive Black Hole (SMBH) with those at $z\gtrsim6$ being comparable in mass to SMBHs at $z\sim1$. The formation mechanism of SMBHs remains the subject of much debate, yet...
Roughly 10 billion years ago, during the Universe’s most active phase of star formation and black hole accretion, commonly known as Cosmic Noon, an extreme structure was discovered: a dense concentration of 11 luminous quasars within a comoving volume of $\sim 40$ cMpc$^3$ at redshift $z \approx 2.2$. This extreme...
ALMA and JWST have been pushing up the redshift frontier to z~14 and pioneering metal emission line studies in star-forming galaxies at $z > 5$. These telescopes are powerful tools for high-redshift probes even on their own, but their multi-wavelength synergy is opening a new window in the high-redshift studies....
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...
Among the most energetic processes in the Universe, Active Galactic Nuclei (AGN) have been found throughout cosmic history; powered by a central Supermassive Black Hole (SMBH) with those at $z\gtrsim6$ being comparable in mass to SMBHs at $z\sim1$. The formation mechanism of SMBHs remains the subject of much debate, yet...
January 2026 15 : 30 AGN, early universe, and X-rays
Roughly 10 billion years ago, during the Universe’s most active phase of star formation and black hole accretion, commonly known as Cosmic Noon, an extreme structure was discovered: a dense concentration of 11 luminous quasars within a comoving volume of $\sim 40$ cMpc$^3$ at redshift $z \approx 2.2$. This extreme...
November 2025 15 : 30 quasars, large scale structure, and high-z galaxies
ALMA and JWST have been pushing up the redshift frontier to z~14 and pioneering metal emission line studies in star-forming galaxies at $z > 5$. These telescopes are powerful tools for high-redshift probes even on their own, but their multi-wavelength synergy is opening a new window in the high-redshift studies....
October 2025 15 : 30 ALMA, JWST, and high-z galaxies
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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