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Yutaka Hirai
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Enrichment of r-process elements in dwarf spheroidal galaxies in chemo-dynamical evolution model
Y Hirai, Y Ishimaru, TR Saitoh, MS Fujii, J Hidaka, T Kajino
The Astrophysical Journal 814 (1), 41, 2015
1102015
R-process enhancements of Gaia-Enceladus in GALAH DR3
T Matsuno, Y Hirai, Y Tarumi, K Hotokezaka, M Tanaka, A Helmi
Astronomy & Astrophysics 650, A110, 2021
492021
EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
A Matsumoto, M Ouchi, K Nakajima, M Kawasaki, K Murai, K Motohara, ...
The Astrophysical Journal 941 (2), 167, 2022
392022
Enrichment of Zinc in galactic chemodynamical evolution models
Y Hirai, TR Saitoh, Y Ishimaru, S Wanajo
The Astrophysical Journal 855 (1), 63, 2018
372018
Neutron star mergers as the astrophysical site of the r-process in the Milky Way and its satellite galaxies
S Wanajo, Y Hirai, N Prantzos
Monthly Notices of the Royal Astronomical Society 505 (4), 5862-5883, 2021
352021
Early chemo-dynamical evolution of dwarf galaxies deduced from enrichment of r-process elements
Y Hirai, Y Ishimaru, TR Saitoh, MS Fujii, J Hidaka, T Kajino
Monthly Notices of the Royal Astronomical Society 466 (2), 2474-2487, 2017
332017
SIRIUS project. I. Star formation models for star-by-star simulations of star clusters and galaxy formation
Y Hirai, MS Fujii, TR Saitoh
Publications of the Astronomical Society of Japan 73 (4), 1036-1056, 2021
292021
Efficiency of metal mixing in dwarf galaxies
Y Hirai, TR Saitoh
The Astrophysical Journal Letters 838 (2), L23, 2017
242017
SIRIUS project. III. Star-by-star simulations of star cluster formation using a direct N-body integrator with stellar feedback
MS Fujii, TR Saitoh, Y Hirai, L Wang
Publications of the Astronomical Society of Japan 73 (4), 1074-1099, 2021
222021
Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars
J Zepeda, TC Beers, VM Placco, D Shank, D Gudin, Y Hirai, M Mardini, ...
The Astrophysical Journal 947 (1), 23, 2023
162023
Origin of highly r-process-enhanced stars in a cosmological zoom-in simulation of a Milky Way-like galaxy
Y Hirai, TC Beers, M Chiba, W Aoki, D Shank, TR Saitoh, T Okamoto, ...
Monthly Notices of the Royal Astronomical Society 517 (4), 4856-4874, 2022
162022
SIRIUS project. II. A new tree-direct hybrid code for smoothed particle hydrodynamics/N-body simulations of star clusters
MS Fujii, TR Saitoh, L Wang, Y Hirai
Publications of the Astronomical Society of Japan 73 (4), 1057-1073, 2021
162021
Enrichment of Strontium in Dwarf Galaxies
Y Hirai, S Wanajo, TR Saitoh
The Astrophysical Journal 885 (1), 33, 2019
162019
Dark matter halo properties of the galactic dwarf satellites: Implication for chemo-dynamical evolution of the satellites and a challenge to lambda cold dark matter
K Hayashi, Y Hirai, M Chiba, T Ishiyama
The Astrophysical Journal 953 (2), 185, 2023
42023
Insights on the Sun Birth Environment in the Context of Star Cluster Formation in Hub–Filament Systems
D Arzoumanian, S Arakawa, MIN Kobayashi, K Iwasaki, K Fukuda, S Mori, ...
The Astrophysical Journal Letters 947 (2), L29, 2023
32023
EMPRESS. XI. SDSS and JWST Search for Local and z∼ 4–5 Extremely Metal-poor Galaxies (EMPGs): Clustering and Chemical Properties of Local EMPGs
M Nishigaki, M Ouchi, K Nakajima, Y Ono, M Rauch, Y Isobe, Y Harikane, ...
The Astrophysical Journal 952 (1), 11, 2023
22023
SIRIUS Project–V. Formation of off-centre ionized bubbles associated with Orion Nebula Cluster
MS Fujii, K Hattori, L Wang, Y Hirai, J Kumamoto, Y Shimajiri, TR Saitoh
Monthly Notices of the Royal Astronomical Society 514 (1), 43-54, 2022
22022
Predicting the expansion of supernova shells for high-resolution galaxy simulations using deep learning
K Hirashima, K Moriwaki, MS Fujii, Y Hirai, T Saitoh, J Makino
Journal of Physics: Conference Series 2207 (1), 012050, 2022
22022
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely Metal-poor Galaxies
Y Xu, M Ouchi, Y Isobe, K Nakajima, S Ozaki, NF Bouché, JH Wise, ...
The Astrophysical Journal 961 (1), 49, 2024
12024
Probing the Galactic halo with RR Lyrae stars–V. Chemistry, kinematics, and dynamically tagged groups
J Cabrera Garcia, TC Beers, Y Huang, XY Li, G Liu, H Zhang, J Hong, ...
Monthly Notices of the Royal Astronomical Society 527 (3), 8973-8990, 2024
12024
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