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Current signatures and search for Pop. III stars in the Local Universe
Yutaka Komiya, Takuma Suda, Masayuki Fujimoto
Recent numerical studies argue that low-mass stars can be formed even at zero-metallicity environment. These low-mass Population III(Pop.~III) stars are thought to be still shining…
The Stellar Abundances for Galactic Archaeology (SAGA) Database III - Analysis of Enrichment Histories for Elements and Two Modes of Star Formation during the Early Evolution of Milky Way
Shimako Yamada, Takuma Suda, Yutaka Komiya +2
We study the enrichment histories for nine elements, C, four alpha-elements of Mg, Si, Ca, and Ti, Sc, and three iron-peak elements of Co, Ni, and Zn, by using a large number of st…
A Cross-correlation Analysis of AGN and Galaxies using Virtual Observatory: Dependence on Virial Mass of Super-Massive Black Hole
Yutaka Komiya, Yuji Shirasaki, Masatoshi Ohishi +1
We present results of the cross-correlation analysis between active galactic nuclei (AGNs) and galaxies at redshift 0.1-1. We obtain data of ~10,000 SDSS AGNs in which their virial…
Transition of the Stellar Initial Mass Function Explored with Binary Population Synthesis
Takuma Suda, Yutaka Komiya, Shimako Yamada +7
The stellar initial mass function (IMF) plays a crucial role in determining the number of surviving stars in galaxies, the chemical composition of the interstellar medium, and the…