Search Results - "Takayuki, R. Saitoh"

A DENSITY-INDEPENDENT FORMULATION OF SMOOTHED PARTICLE HYDRODYNAMICS by Saitoh, Takayuki R, Makino, Junichiro

“…The standard formulation of the smoothed particle hydrodynamics (SPH) assumes that the local density distribution is differentiable. This assumption is used to…”
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SIRIUS project. I. Star formation models for star-by-star simulations of star clusters and galaxy formation by Hirai, Yutaka, Fujii, Michiko S, Saitoh, Takayuki R

“…Abstract Most stars are formed as star clusters in galaxies, which then disperse into galactic disks. Upcoming exascale supercomputational facilities will…”
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Eventful evolution of giant molecular clouds in dynamically evolving spiral arms by Baba, Junichi, Morokuma-Matsui, Kana, Saitoh, Takayuki R

“…The formation and evolution of giant molecular clouds (GMCs) in spiral galaxies have been investigated in the traditional framework of the combined…”
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Natures of a clump-origin bulge: a pseudo-bulge like but old metal-rich bulge by Inoue, Shigeki, Saitoh, Takayuki R.

“…Bulges in spiral galaxies have been supposed to be classified into classical bulges or pseudo-bulges. Classical bulges are thought to form by galactic merger…”
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Compact Object Mergers Driven by Gas Fallback by Tagawa, Hiromichi, Saitoh, Takayuki R, Kocsis, Bence

“…Recently, several gravitational wave detections have shown evidence for compact object mergers. However, the astrophysical origin of merging binaries is not…”
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SIRIUS project. II. A new tree-direct hybrid code for smoothed particle hydrodynamics/ N -body simulations of star clusters by Fujii, Michiko S, Saitoh, Takayuki R, Wang, Long, Hirai, Yutaka

“…Abstract Star clusters form via clustering star formation inside molecular clouds. In order to understand the dynamical evolution of star clusters in their…”
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Enrichment of Zinc in Galactic Chemodynamical Evolution Models by Hirai, Yutaka, Saitoh, Takayuki R., Ishimaru, Yuhri, Wanajo, Shinya

“…The heaviest iron-peak element Zinc (Zn) has been used as an important tracer of cosmic chemical evolution. Spectroscopic observations of the metal-poor stars…”
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Origin of highly r -process-enhanced stars in a cosmological zoom-in simulation of a Milky Way-like galaxy by Hirai, Yutaka, Beers, Timothy C, Chiba, Masashi, Aoki, Wako, Shank, Derek, Saitoh, Takayuki R, Okamoto, Takashi, Makino, Junichiro

“…ABSTRACT The r-process-enhanced (RPE) stars provide fossil records of the assembly history of the Milky Way (MW) and the nucleosynthesis of the heaviest…”
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Chemo-dynamical Evolution of Simulated Satellites for a Milky Way–like Galaxy by Hirai, Yutaka, Kirby, Evan N., Chiba, Masashi, Hayashi, Kohei, Anguiano, Borja, Saitoh, Takayuki R., Ishigaki, Miho N., Beers, Timothy C.

“…Abstract The chemical abundances of Milky Way’s (MW's) satellites reflect their star formation histories (SFHs), yet, due to the difficulty of determining the…”
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Property of young massive clusters in a galaxy–galaxy merger remnant by Matsui, Hidenori, Tanikawa, Ataru, Saitoh, Takayuki R

“…Abstract We investigate the properties of young massive clusters (YMCs) in a galaxy–galaxy merger remnant by analyzing the data obtained by a gas-rich major…”
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Massive first star binaries as new tools for Galactic archaeology by Suda, Takuma, Saitoh, Takayuki R., Moritani, Yuki, Matsuno, Tadafumi, Shigeyama, Toshikazu

“…Binary systems are important probes of the origin of stars with peculiar chemical features through the interactions between two stars. We have studied the…”
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DYNAMICS OF NON-STEADY SPIRAL ARMS IN DISK GALAXIES by Baba, Junichi, Saitoh, Takayuki R, Wada, Keiichi

“…In order to understand the physical mechanisms underlying non-steady stellar spiral arms in disk galaxies, we analyzed the growing and damping phases of their…”
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On the Interpretation of the l–v Features in the Milky Way Galaxy by Junichi, Baba, Takayuki, R. Saitoh, Keiichi, Wada

“…We modeled the gas dynamics of barred galaxies using a three-dimensional, high-resolution, $N$ -body $+$ hydrodynamical simulation, and applied it to the Milky…”
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FAST: A Fully Asynchronous Split Time-Integrator for a Self-Gravitating Fluid by Saitoh, Takayuki R., Makino, Junichiro

“…We describe a new algorithm for the integration of self-gravitating fluid systems using SPH method. We split the Hamiltonian of a self-gravitating fluid system…”
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Exploring the Sun’s birth radius and the distribution of planet building blocks in the Milky Way galaxy: a multizone Galactic chemical evolution approach by Baba, Junichi, Saitoh, Takayuki R, Tsujimoto, Takuji

“…ABSTRACT We explore the influence of the Milky Way galaxy’s chemical evolution on the formation, structure, and habitability of the Solar system. Using a…”
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Interplay between Stellar Spirals and the Interstellar Medium in Galactic Disks by Wada, Keiichi, Baba, Junichi, Saitoh, Takayuki R

“…We propose a new dynamical picture of galactic stellar and gas spirals, based on hydrodynamic simulations in a 'live' stellar disk. We focus especially on…”
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Enrichment of Strontium in Dwarf Galaxies by Hirai, Yutaka, Wanajo, Shinya, Saitoh, Takayuki R.

“…Light trans-iron elements such as Sr serve as the key to understanding the astrophysical sites of heavy elements. Spectroscopic studies of metal-poor stars…”
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A Necessary Condition for Individual Time Steps in SPH Simulations by Saitoh, Takayuki R, Makino, Junichiro

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Testing the effect of resolution on gravitational fragmentation with Lagrangian hydrodynamic schemes by Yamamoto, Yasuyoshi, Okamoto, Takashi, Saitoh, Takayuki R

“…ABSTRACT To study the resolution required for simulating gravitational fragmentation with newly developed Lagrangian hydrodynamic schemes, meshless…”
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ENRICHMENT OF r-PROCESS ELEMENTS IN DWARF SPHEROIDAL GALAXIES IN CHEMO-DYNAMICAL EVOLUTION MODEL by Hirai, Yutaka, Ishimaru, Yuhri, Saitoh, Takayuki R., Fujii, Michiko S., Hidaka, Jun, Kajino, Toshitaka

“…ABSTRACT The rapid neutron-capture process (r-process) is a major process for the synthesis of elements heavier than iron-peak elements, but the astrophysical…”
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