244 citations · 1.2k across the 28 of their papers we have counts for
28 papers
Cosmic Ray Feedback in Galactic Disks: Star Formation, Cosmic Ray Transport, and Multiphase Outflows in TIGRESS++ Simulations
Chang-Goo Kim, Lucia Armillotta, Eve C. Ostriker +5
We present new simulations of local star-forming disks that self-consistently evolve cosmic rays (CRs) and multiphase gas using TIGRESS++. To isolate the role of CRs, we conduct pa…
MHD Simulations of Strongly Magnetized HII Region Evolution: Evidence for Ionized Gas Filamentation
Samuel Crowe, Yisheng Tu, Zhi-Yun Li +2
Recent JWST observations of HII regions in the Central Molecular Zone have shown a highly filamentary morphology distinct from HII regions in other parts of the galaxy. We present…
The Co-Evolution of Stellar Wind-blown Bubbles and Photoionized Gas II: 3D RMHD Simulations and Tests of Semi-Analytic Models
Lachlan Lancaster, Chang-Goo Kim, Jeong-Gyu Kim +2
In a companion paper (Paper I) we presented a Co-Evolution Model (CEM) in which to consider the evolution of feedback bubbles driven by massive stars through both stellar winds and…
The Co-Evolution of Stellar Wind-blown Bubbles and Photoionized Gas I: Physical Principles and a Semi-Analytic Model
Lachlan Lancaster, Jeong-Gyu Kim, Greg L. Bryan +3
We propose a new framework for the simultaneous feedback of stellar winds and photo-ionizing radiation from massive stars, distinguishing the locations where forces are applied, an…
A Rotational Disruption Crisis for Zodiacal Dust
Kedron Silsbee, Brandon S. Hensley, Jamey R. Szalay +2
A systematic torque from anisotropic radiation can rapidly spin up irregular grains to the point of breakup. We apply the standard theory of rotational disruption from radiative to…
Ultraviolet Radiation Fields in Star-Forming Disk Galaxies: Numerical Simulations with TIGRESS-NCR
Nora B. Linzer, Jeong-Gyu Kim, Chang-Goo Kim +1
With numerical simulations that employ adaptive ray-tracing (ART) for radiative transfer at the same time as evolving gas magnetohydrodynamics, thermodynamics, and photochemistry,…
Metallicity Dependence of Pressure-Regulated Feedback-Modulated Star Formation in the TIGRESS-NCR Simulation Suite
Chang-Goo Kim, Eve C. Ostriker, Jeong-Gyu Kim +8
We present a new simulation suite for the star-forming interstellar medium (ISM) in galactic disks using the TIGRESS-NCR framework. Distinctive aspects of our simulation suite are:…
Geometry, Dissipation, Cooling, and the Dynamical Evolution of Wind-Blown Bubbles
Lachlan Lancaster, Eve C. Ostriker, Chang-Goo Kim +2
Bubbles driven by energy and mass injection from small scales are ubiquitous in astrophysical fluid systems and essential to feedback across multiple scales. In particular, O stars…
Implementation of chemistry in the Athena++ code
Munan Gong, Ka-Wai Ho, James M. Stone +6
Chemistry plays a key role in many aspects of astrophysical fluids. Atoms and molecules are agents for heating and cooling, determine the ionization fraction, serve as observationa…
Introducing TIGRESS-NCR: I. Co-Regulation of the Multiphase Interstellar Medium and Star Formation Rates
Chang-Goo Kim, Jeong-Gyu Kim, Munan Gong +1
Massive, young stars are the main source of energy that maintains multiphase structure and turbulence in the interstellar medium (ISM), and without this "feedback" the star formati…
Photochemistry and Heating/Cooling of the Multiphase Interstellar Medium with UV Radiative Transfer for Magnetohydrodynamic Simulations
Jeong-Gyu Kim, Munan Gong, Chang-Goo Kim +1
We present an efficient heating/cooling method coupled with chemistry and ultraviolet (UV) radiative transfer, which can be applied to numerical simulations of the interstellar med…
Physical Modeling of Dust Polarization from Magnetically Enhanced Radiative Torque (MRAT) Alignment in Protostellar Cores with POLARIS
Nguyen Chau Giang, Thiem Hoang, Jeong-Gyu Kim +1
Magnetic fields () are an important factor that controls the star formation process. The leading method to observe is using polarized thermal emission from…
Slow Star Formation in the Milky Way: Theory Meets Observations
Neal J. Evans, Jeong-Gyu Kim, Eve C. Ostriker
The observed star formation rate of the Milky Way can be explained by applying a metallicity-dependent factor to convert CO luminosity to molecular gas mass and a star formation ef…
Star Formation Regulation and Self-Pollution by Stellar Wind Feedback
Lachlan Lancaster, Eve C. Ostriker, Jeong-Gyu Kim +1
Stellar winds contain enough energy to easily disrupt the parent cloud surrounding a nascent star cluster, and for this reason have been considered candidates for regulating star f…
Efficiently Cooled Stellar Wind Bubbles in Turbulent Clouds II. Validation of Theory with Hydrodynamic Simulations
Lachlan Lancaster, Eve C. Ostriker, Jeong-Gyu Kim +1
In a companion paper, we develop a theory for the evolution of stellar wind driven bubbles in dense, turbulent clouds. This theory proposes that turbulent mixing at a fractal bubbl…
Efficiently Cooled Stellar Wind Bubbles in Turbulent Clouds I. Fractal Theory and Application to Star-Forming Clouds
Lachlan Lancaster, Eve C. Ostriker, Jeong-Gyu Kim +1
Winds from massive stars have velocities of 1000 km/s or more, and produce hot, high pressure gas when they shock. We develop a theory for the evolution of bubbles driven by the co…
Star Formation Efficiency and Dispersal of Giant Molecular Clouds with UV Radiation Feedback: Dependence on Gravitational Boundedness and Magnetic Fields
Jeong-Gyu Kim, Eve C. Ostriker, Nina Filippova
Molecular clouds are supported by turbulence and magnetic fields, but quantifying their influence on cloud lifecycle and star formation efficiency (SFE) remains an open question. W…
The environmental dependence of the X_CO conversion factor
Munan Gong, Eve C. Ostriker, Chang-Goo Kim +1
CO is the most widely used observational tracer of molecular gas. The observable CO luminosity is translated to H_2 mass via a conversion factor, X_CO, which is a source of uncerta…
Diffuse Ionized Gas in Simulations of Multiphase, Star-Forming Galactic Disks
Erin Kado-Fong, Jeong-Gyu Kim, Eve C. Ostriker +1
It has been hypothesized that photons from young, massive star clusters are responsible for maintaining the ionization of diffuse warm ionized gas seen in both the Milky Way and ot…
Factories of CO-dark gas: molecular clouds with limited star formation efficiencies by FUV feedback
Mutsuko Inoguchi, Takashi Hosokawa, Shin Mineshige +1
The star formation in molecular clouds is inefficient. The ionizing EUV radiation ( eV) from young clusters has been considered as a primary feedback effect to limit…
Modeling UV Radiation Feedback from Massive Stars: III. Escape of Radiation from Star-forming Giant Molecular Clouds
Jeong-Gyu Kim, Woong-Tae Kim, Eve C. Ostriker
Using a suite of radiation hydrodynamic simulations of star cluster formation in turbulent clouds, we study the escape fraction of ionizing (Lyman continuum) and non-ionizing (FUV)…
Modeling UV Radiation Feedback from Massive Stars: II. Dispersal of Star-Forming Giant Molecular Clouds by Photoionization and Radiation Pressure
Jeong-Gyu Kim, Woong-Tae Kim, Eve C. Ostriker
UV radiation feedback from young massive stars plays a key role in the evolution of giant molecular clouds (GMCs) by photoevaporating and ejecting the surrounding gas. We conduct a…
Modeling UV Radiation Feedback from Massive Stars: I. Implementation of Adaptive Ray Tracing Method and Tests
Jeong-Gyu Kim, Woong-Tae Kim, Eve C. Ostriker +1
We present an implementation of an adaptive ray tracing (ART) module in the Athena hydrodynamics code that accurately and efficiently handles the radiative transfer involving multi…
Disruption of Molecular Clouds by Expansion of Dusty H II Regions
Jeong-Gyu Kim, Woong-Tae Kim, Eve C. Ostriker
Dynamical expansion of H II regions around star clusters plays a key role in dispersing the surrounding dense gas and therefore in limiting the efficiency of star formation in mole…