The Cosmic Himalayas; An Extreme Quasar Concentration at Cosmic Noon Bridging AGNs, Galaxies, and IGM

Yongming Liang

ICRR, The University of Tokyo

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...

Ionization Environment in Star-Forming Galaxies during the Epoch of Reionization

Yuma Sugahara

Waseda University

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....

Looking for black holes through peculiar molecular clouds in the galactic center region

Shunya Takekawa

Kanagawa University

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 signatures in/from the Universe

Nagisa Hiroshima

Yokohama National University

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 star and supermassive black-hole formation through accretinon on cosmological scales

Masaki Kiyuna

Tohoku University

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...

Spatial and spectral variation of the 12CO(J=2-1)/12CO(J=1-0) line ratio in nearby galaxies

Shinya Komugi

Kogakuin University of Technology & Engineering

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 Chemistry in Active Star-Forming Regions

Kotomi Taniguchi

National Astronomical Observatory of Japan

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...

159^th Uchu Forum The Cosmic Himalayas; An Extreme Quasar Concentration at Cosmic Noon Bridging AGNs, Galaxies, and IGM

Yongming Liang (ICRR, The University of Tokyo)

158^th Uchu Forum Ionization Environment in Star-Forming Galaxies during the Epoch of Reionization

Yuma Sugahara (Waseda University)

157^th Uchu Forum Looking for black holes through peculiar molecular clouds in the galactic center region

Shunya Takekawa (Kanagawa University)

156^th Uchu Forum Dark matter signatures in/from the Universe

Nagisa Hiroshima (Yokohama National University)

155^th Uchu Forum Supermassive star and supermassive black-hole formation through accretinon on cosmological scales

Masaki Kiyuna (Tohoku University)

154^th Uchu Forum Spatial and spectral variation of the 12CO(J=2-1)/12CO(J=1-0) line ratio in nearby galaxies

Shinya Komugi (Kogakuin University of Technology & Engineering)

153^rd Uchu Forum Carbon-Chain Chemistry in Active Star-Forming Regions

Kotomi Taniguchi (National Astronomical Observatory of Japan)