84 citations · 468 across the 20 of their papers we have counts for
20 papers
Effects of pair freeze-out on photon distributions in BBN epoch
Jeongyoon Choi, Dukjae Jang, Youngshin Kwon +5
We investigate the evolution of non-extensivity in the photon distribution during the Big Bang Nucleosynthesis (BBN) epoch using Tsallis statistics. Assuming a minimal deviation fr…
Effects of electromagnetic fluctuations in plasmas on solar neutrino fluxes
Eunseok Hwang, Dukjae Jang, Kiwan Park +7
We explore the effects of electromagnetic (EM) fluctuations in plasmas on solar neutrino fluxes exploiting the fluctuation-dissipation theorem. We find that the EM spectrum in the…
Isotopic Compositions of Ruthenium Predicted from the NuGrid Project
Seonho Kim, Kwang Hyun Sung, Kyujin Kwak
The isotopic compositions of ruthenium (Ru) are measured from presolar silicon carbide (SiC) grains. In a popular scenario, the presolar SiC grains formed in the outskirt of an asy…
Measuring Masses and Radii of Neutron Stars in Low-Mass X-ray Binaries: Effects of Atmospheric Composition and Touchdown Radius
Myungkuk Kim, Young-Min Kim, Kwang Hyun Sung +2
Methods. We use both a Monte Carlo (MC) sampling and a Bayesian analysis to find the effects of the photospheric composition and the touchdown radius. We apply these two methods to…
Neutron star equation of state and tidal deformability with nuclear energy density functionals
Young-Min Kim, Kyujin Kwak, Chang Ho Hyun +2
Neutron star is the ultimate testing place for the physics of dense nuclear matter. Before the detection of gravitational waves from the merger of binary neutron stars, various nuc…
Estimating the Fuel Supply Rate on the Galactic Disk from High Velocity Clouds (HVCs) Infall
Kwang Hyun Sung, Kyujin Kwak
Previous studies suggest that the estimated maximum accretion rate from approaching high velocity clouds (HVCs) on the Galactic disk can be up to ~ 0.4 solar mass per year. In this…
Big Bang nucleosynthesis in a weakly non-ideal plasma
Dukjae Jang, Youngshin Kwon, Kyujin Kwak +1
We propose a correction of the standard Big Bang nucleosynthesis (BBN) scenario to resolve the primordial lithium problem by considering a possibility that the primordial plasma ca…
Tidal Deformability of Neutron Stars with Realistic Nuclear Energy Density Functionals
Young-Min Kim, Yeunhwan Lim, Kyujin Kwak +2
We investigate the constraints on the mass and radius of neutron stars by considering the tidal deformability in the merge of neutron star binaries. In order to extract the most re…
Si iv Column Densities Predicted from Non-Equilibrium Ionization Simulations of Turbulent Mixing Layers and High-Velocity Clouds
Kyujin Kwak, Robin L. Shelton, David B. Henley
We present predictions of the Si iv ions in turbulent mixing layers (TMLs) between hot and cool gas and in cool high-velocity clouds (HVCs) that travel through a hot halo, compleme…
The Origin of the Hot Gas in the Galactic Halo: Testing Galactic Fountain Models' X-ray Emission
David B. Henley, Robin L. Shelton, Kyujin Kwak +2
We test the X-ray emission predictions of galactic fountain models against XMM-Newton measurements of the emission from the Milky Way's hot halo. These measurements are from 110 si…
Hyperon Puzzle of Neutron Stars with Skyrme Force Models
Yeunhwan Lim, Chang Ho Hyun, Kyujin Kwak +1
We consider the so called hyperon puzzle of neutron star (NS). We employ Skyrme force models for the description of in-medium nucleon-nucleon, nucleon-Lambda hyperon (), and La…
Mixing between High Velocity Clouds and the Galactic Halo
Jeffrey A. Gritton, Robin L. Shelton, Kyujin Kwak
In the Galactic halo, metal-bearing Galactic halo material mixes into high velocity clouds (HVCs) as they hydrodynamically interact. This interaction begins long before the clouds…
The Origin of the X-ray Emission from the High-velocity Cloud MS30.7-81.4-118
David B. Henley, Robin L. Shelton, Kyujin Kwak
A soft X-ray enhancement has recently been reported toward the high-velocity cloud MS30.7-81.4-118 (MS30.7), a constituent of the Magellanic Stream. In order to investigate the ori…
Kaon Condensation in Neutron Stars with Skyrme-Hartree-Fock Models
Yeunhwan Lim, Kyujin Kwak, Chang Ho Hyun +1
We investigate nuclear matter equations of state in neutron star with kaon condensation. It is generally known that the existence of kaons in neutron star makes the equation of sta…
Modeling the X-rays Resulting from High Velocity Clouds
Robin L. Shelton, Kyujin Kwak, David B. Henley
With the goal of understanding why X-rays have been reported near some high velocity clouds, we perform detailed 3 dimensional hydrodynamic and magnetohydrodynamic simulations of c…
Simulations of High-Velocity Clouds. II. Ablation from High-Velocity Clouds as a Source of Low-Velocity High Ions
David B. Henley, Kyujin Kwak, Robin L. Shelton
In order to determine if the material ablated from high-velocity clouds (HVCs) is a significant source of low-velocity high ions (C IV, N V, and O VI) such as those found in the Ga…
Simulations of High-Velocity Clouds. I. Hydrodynamics and High-Velocity High Ions
Kyujin Kwak, David B. Henley, Robin L. Shelton
We present hydrodynamic simulations of high-velocity clouds (HVCs) traveling through the hot, tenuous medium in the Galactic halo. A suite of models was created using the FLASH hyd…
Numerical Study of Turbulent Mixing Layers with Non-Equilibrium Ionization Calculations
Kyujin Kwak, Robin L. Shelton
Highly ionized species such as C IV, N V, and O VI, are commonly observed in diffuse gas in various places in the universe, such as in our Galaxy's disk and halo, high velocity clo…
The Origin of the Hot Gas in the Galactic Halo: Confronting Models with XMM-Newton Observations
David B. Henley, Robin L. Shelton, Kyujin Kwak +2
We compare the predictions of three physical models for the origin of the hot halo gas with the observed halo X-ray emission, derived from 26 high-latitude XMM-Newton observations…
The Evolution of Gas Clouds Falling in the Magnetized Galactic Halo: High Velocity Clouds (HVCs) Originated in the Galactic Fountain
Kyujin Kwak, Robin L. Shelton, Elizabeth A. Raley
In the Galactic fountain scenario, supernovae and/or stellar winds propel material into the Galactic halo. As the material cools, it condenses into clouds. By using FLASH three-dim…