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astro-ph.GA2026
Overmassive black holes and little red dots naturally form in simulations
Sunmyon Chon, Shingo Hirano, Tomoaki Ishiyama +2
The origin of supermassive black holes (SMBHs) remains a long-standing problem in astrophysics. Recent JWST observations reveal an unexpectedly abundant population of overmassive b…
astro-ph.GA2025
A Semi-analytic Framework of Population III and Subsequent Galaxy Formation on Cosmological N-body Simulations
Tomoaki Ishiyama, Shingo Hirano
We develop a new semi-analytic framework of Population (Pop) III and subsequent galaxy formation designed to run on dark matter halo merger trees. In our framework, we consider the…
astro-ph.GA2025
Formation of first star clusters under the supersonic gas flow -- II. Critical halo mass and core mass function
Shingo Hirano
The formation and mass distribution of the first stars depend on various environmental factors in the early universe. We compare 120 cosmological hydrodynamical simulations to expl…