Masafumi Noguchi
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View article: Anatomy of galactic star formation history: roles of different modes of gas accretion, feedback, and recycling
Anatomy of galactic star formation history: roles of different modes of gas accretion, feedback, and recycling Open
We investigate how the diverse star formation histories observed across galaxy masses emerged using models that evolve under gas accretion from host haloes. They also include ejection of interstellar matter by supernova feedback, recycling…
View article: Anatomy of galactic star formation history: Roles of different modes of gas accretion, feedback, and recycling
Anatomy of galactic star formation history: Roles of different modes of gas accretion, feedback, and recycling Open
We investigate how the diverse star formation histories observed across galaxy masses emerged using models that evolve under gas accretion from host halos. They also include ejection of interstellar matter by supernova feedback, recycling …
View article: Formation of galactic bulges from the cold gas filaments in high-redshift dark matter haloes
Formation of galactic bulges from the cold gas filaments in high-redshift dark matter haloes Open
Formation process(es) of galactic bulges are not yet clarified, although several mechanisms have been proposed. In a previous study, we suggested one possibility that galactic bulges have been formed from the cold gas inflowing through sur…
View article: Formation of galactic bulges from the cold gas filaments in high-redshift dark matter halos
Formation of galactic bulges from the cold gas filaments in high-redshift dark matter halos Open
Formation process(es) of galactic bulges are not yet clarified although several mechanisms have been proposed. In a previous study, we suggested one possibility that galactic bulges have been formed from the cold gas inflowing through surr…
View article: Fundamental mechanism of the creation of chemical bimodality in the Milky Way disc in the cold accretion theory
Fundamental mechanism of the creation of chemical bimodality in the Milky Way disc in the cold accretion theory Open
Chemical bimodality of the Milky Way (MW) disc stars constitutes one of the most remarkable properties of MW. The cold accretion theory for the cosmological gas accretion provides one viable explanation to this phenomenon. In this scenario…
View article: Financial Literacy and Exercise Behavior: Evidence from Japan
Financial Literacy and Exercise Behavior: Evidence from Japan Open
Lack of exercise, which increases the risk of many serious physical and mental illness, has been a common health issue in Japan. Recent studies confirm that financial literacy discourages irrational behavior like gambling and smoking. We t…
View article: Structural diversity of disc galaxies originating in the cold gas inflow from cosmic webs
Structural diversity of disc galaxies originating in the cold gas inflow from cosmic webs Open
Disc galaxies show a large morphological diversity with varying contribution of three major structural components: thin discs, thick discs, and central bulges. Dominance of bulges increases with the galaxy mass (Hubble sequence), whereas t…
View article: Morphological diversity of spiral galaxies originating in the cold gas inflow from cosmic webs
Morphological diversity of spiral galaxies originating in the cold gas inflow from cosmic webs Open
Spiral galaxies comprise three major structural components; thin discs, thick discs, and central bulges. Relative dominance of these components is known to correlate with the total mass of the galaxy, and produces a remarkable morphologica…
View article: Morphological diversity of spiral galaxies originating in the cold gas\n inflow from cosmic webs
Morphological diversity of spiral galaxies originating in the cold gas\n inflow from cosmic webs Open
Spiral galaxies comprise three major structural components; thin discs, thick\ndiscs, and central bulges. Relative dominance of these components is known to\ncorrelate with the total mass of the galaxy, and produces a remarkable\nmorpholog…
View article: Cold accretion flows and chemical bimodality of the Milky Way galaxy
Cold accretion flows and chemical bimodality of the Milky Way galaxy Open
Abundance of chemical elements in the stars provides important clues regarding galaxy formation. The most powerful diagnostics is the relative abundance of α-elements (O, Mg, Si, S, Ca, and Ti) with respect to iron (Fe), [α/Fe], each of wh…
View article: The formation of solar-neighbourhood stars in two generations separated by 5 billion years
The formation of solar-neighbourhood stars in two generations separated by 5 billion years Open
View article: Possible Imprints of Cold-mode Accretion on the Present-day Properties of Disk Galaxies
Possible Imprints of Cold-mode Accretion on the Present-day Properties of Disk Galaxies Open
Recent theoretical studies suggest that a significant part of the primordial gas accretes onto forming galaxies as narrow filaments of cold gas without building a shock and experiencing heating. Using a simple model of disk galaxy evolutio…
View article: GLOBAL SPIRAL ARMS FORMATION BY NON-LINEAR INTERACTION OF WAKELETS
GLOBAL SPIRAL ARMS FORMATION BY NON-LINEAR INTERACTION OF WAKELETS Open
The formation and evolution of galactic spiral arms is not yet clearly understood despite much analytic and numerical work. Recently, the new idea has been proposed that local density enhancements (wakelets) arising in the galactic disk co…
View article: FROM DIVERSITY TO DICHOTOMY, AND QUENCHING: MILKY-WAY-LIKE AND MASSIVE-GALAXY PROGENITORS AT 0.5 <<i>z</i>< 3.0
FROM DIVERSITY TO DICHOTOMY, AND QUENCHING: MILKY-WAY-LIKE AND MASSIVE-GALAXY PROGENITORS AT 0.5 <<i>z</i>< 3.0 Open
Using the HST/WFC3 and ACS multi-band imaging data taken in CANDELS and\n3D-HST, we study the general properties and the diversity of the progenitors of\nthe Milky Way (MWs) and local massive galaxy (MGs) at 0.5 < z < 3.0, based on a\ncons…