562 citations · 933 across the 24 of their papers we have counts for
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The Supersonic Project: Early Star Formation with the Streaming Velocity
William Lake, Claire E. Williams, Smadar Naoz +7
At high redshifts (), the relative velocity between baryons and dark matter (the so-called streaming velocity) significantly affects star formation in low-mass objects.…
Amplification and saturation of turbulent magnetic field in collapsing primordial gas clouds
Sho Higashi, Hajime Susa, Christoph Federrath +1
Recent numerical studies suggest that magnetic fields play an important role in primordial star formation in the early universe. However, the detailed evolution of the magnetic fie…
The Supersonic Project: Lighting up the faint end of the JWST UV luminosity function
Claire E. Williams, William Lake, Smadar Naoz +9
The James Webb Space Telescope (JWST) is capable of probing extremely early eras of our Universe when the supersonic relative motions between dark matter and baryonic overdensities…
The Supersonic Project: Star Formation in Early Star Clusters without Dark Matter
William Lake, Smadar Naoz, Federico Marinacci +7
The formation mechanism of globular clusters (GCs) has long been debated by astronomers. It was recently proposed that Supersonically Induced Gas Objects (SIGOs), which formed in t…
Direct-collapse black hole formation induced by internal radiation of host halos
Gen Chiaki, Sunmyon Chon, Kazuyuki Omukai +3
We estimate the fraction of halos that host supermassive black holes (SMBHs) forming through the direct collapse (DC) scenario by using cosmological N -body simulations combined wi…
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
Yi Xu, Masami Ouchi, Yuki Isobe +49
We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of and low stellar masses of $10^4-…
The Supersonic Project: The eccentricity and rotational support of SIGOs and DM GHOSts
Claire E. Williams, Smadar Naoz, William Lake +7
A supersonic relative velocity between dark matter (DM) and baryons (the stream velocity) at the time of recombination induces the formation of low mass objects with anomalous prop…
Saturation level of turbulence in collapsing gas clouds
Sho Higashi, Hajime Susa, Gen Chiaki
We investigate the physical mechanism that decides the saturation level of turbulence in collapsing gas clouds. We perform a suite of high-resolution numerical simulations followin…
The Supersonic Project: The Early Evolutionary Path of SIGOs
William Lake, Smadar Naoz, Blakesley Burkhart +7
Supersonically Induced Gas Objects (SIGOs) are a class of early Universe objects that have gained attention as a potential formation route for globular clusters. SIGOs have only re…
EMPRESS. IX. Extremely Metal-Poor Galaxies are Very Gas-Rich Dispersion-Dominated Systems: Will JWST Witness Gaseous Turbulent High-z Primordial Galaxies?
Yuki Isobe, Masami Ouchi, Kimihiko Nakajima +49
We present kinematics of 6 local extremely metal-poor galaxies (EMPGs) with low metallicities () and low stellar masses (). Tak…
Triggered Population III star formation: the effect of H self-shielding
Gen Chiaki, John H. Wise
The multiplicity of metal-free (Population III) stars may influence their feedback efficiency within their host dark matter halos, affecting subsequent metal enrichment and the tra…
Accelerated growth of seed black holes by dust in the early universe
KwangHo Park, Gen Chiaki, John H. Wise
We explore the effect of dust on the growth of seed black holes (BHs) in the early universe. Previous 1D radiation-hydrodynamic (RHD) simulations show that increased radiation pres…
cooling and gravitational collapse of supersonically induced gas objects
Yurina Nakazato, Gen Chiaki, Naoki Yoshida +3
We study the formation and gravitational collapse of supersonically induced gas objects (SIGOs) in the early universe. We run cosmological hydrodynamics simulations of SIGOs, inclu…
Amplification of turbulence in contracting prestellar cores in primordial minihalos
Sho Higashi, Hajime Susa, Gen Chiaki
We investigate the amplification of turbulence through gravitational contraction of the primordial gas in minihalos. We perform numerical simulations to follow the cloud collapse,…
Disc fragmentation and oligarchic growth of protostellar systems in low-metallicity gas clouds
Gen Chiaki, Naoki Yoshida
We study low-metallicity star formation with a set of high-resolution hydrodynamics simulations for various gas metallicities over a wide range --.…
Formation of massive stars under protostellar radiation feedback: Very metal-poor stars
Hajime Fukushima, Takashi Hosokawa, Gen Chiaki +3
We study the formation of very metal-poor stars under protostellar radiative feedback effect. We use cosmological simulations to identify low-mass dark matter halos and star-formin…
Gravitational collapse and the thermal evolution of low-metallicity gas clouds in the early Universe
Gen Chiaki, Naoki Yoshida, Shingo Hirano
We study gravitational collapse of low-metallicity gas clouds and the formation of protostars by three-dimensional hydrodynamic simulations. Grain growth, non-equilibrium chemistry…
Dust grain growth and the formation of the extremely primitive star SDSS J102915+172927
Gen Chiaki, Raffaella Schneider, Takaya Nozawa +4
Dust grains in low-metallicity star-forming regions may be responsible for the formation of the first low-mass stars. The minimal conditions to activate dust-induced fragmentation…
Growth of dust grains in a low-metallicity gas and its effect on the cloud fragmentation
Gen Chiaki, Takaya Nozawa, Naoki Yoshida
In a low-metallicity gas, rapid cooling by dust thermal emission is considered to induce cloud fragmentation and play a vital role in the formation of low-mass stars (<~ 1 M_sun) i…