Jonathan Stern
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View article: Molecular Hydrogen in High-redshift Damped Ly <i>α</i> Absorbers
Molecular Hydrogen in High-redshift Damped Ly <i>α</i> Absorbers Open
Simulations predict that circumgalactic hydrogen gas surrounding massive ( ) galaxies at z ∼ 4 may be predominantly neutral and could produce damped Ly α absorbers (DLAs) along sight lines to background quasars. A circ…
View article: Hot accretion onto spiral galaxies: the origin of extended and warped HI discs
Hot accretion onto spiral galaxies: the origin of extended and warped HI discs Open
Gas accretion, hot ($\sim 10^6\,{\rm K}$) atmospheres, and a tilt between the rotation axes of the disc and the atmosphere are all robust predictions of standard cosmology for massive star-forming galaxies at low redshift. Using idealized …
View article: Accretion-Driven Turbulence in the Circumgalactic Medium
Accretion-Driven Turbulence in the Circumgalactic Medium Open
Both observations and hydrodynamic simulations suggest that turbulence is ubiquitous in the circumgalactic medium (CGM). We study the development and properties of CGM turbulence driven by accretion in halo masses of $10^{10}-10^{13}\,{\rm…
View article: Discs no more: the morphology of low-mass simulated galaxies in FIREbox
Discs no more: the morphology of low-mass simulated galaxies in FIREbox Open
We study the morphology of hundreds of simulated central galaxies in the stellar mass range $M_\star =$ 107.5–1011 $\rm M_\odot$ from the FIREbox cosmological volume. We demonstrate that FIREbox is able to predict a wide variety of morphol…
View article: MUSEQuBES: Physical conditions, origins, and multi-element abundances of the circumgalactic medium of an isolated, star-forming dwarf galaxy at z=0.57
MUSEQuBES: Physical conditions, origins, and multi-element abundances of the circumgalactic medium of an isolated, star-forming dwarf galaxy at z=0.57 Open
In dwarf galaxy models, outflows expel metal-enriched interstellar medium (ISM) into the circumgalactic medium (CGM) to reproduce their observed low metallicities, but measurements of dwarf CGM properties are scarce. We present a study of …
View article: Turbulence-dominated CGM: the origin of UV absorbers with equivalent widths of ∼1 Å
Turbulence-dominated CGM: the origin of UV absorbers with equivalent widths of ∼1 Å Open
Theoretical arguments and observations suggest that in massive haloes ($>10^{12}\, {\rm M}_\odot$), the circumgalactic medium (CGM) is dominated by a ‘hot’ phase with gas temperature near the virial temperature ($T\approx T_{\rm vir}$) …
View article: Molecular Hydrogen in High-redshift Damped Lyman-α Absorbers
Molecular Hydrogen in High-redshift Damped Lyman-α Absorbers Open
Simulations predict that circumgalactic hydrogen gas surrounding massive ($M_{\rm{halo}}^{z=1}=10^{12}-10^{13}\ M_{\odot}$) galaxies at $z\sim4$ may be predominantly neutral, and could produce damped Ly$α$ absorbers (DLAs) along sight-line…
View article: A Turbulent Framework for Star Formation in High-Redshift Galaxies
A Turbulent Framework for Star Formation in High-Redshift Galaxies Open
Observations of distant galaxies suggest that the physics of galaxy formation at high redshifts differs significantly from later times. In contrast to large, steady disk galaxies like the Milky Way, high-redshift galaxies are often charact…
View article: Kinematics of Circumgalactic O VI Gas and Disk Rotation of $z\approx0.2$ Star-forming Galaxies
Kinematics of Circumgalactic O VI Gas and Disk Rotation of $z\approx0.2$ Star-forming Galaxies Open
Quasar sightline observations reveal that low-ionization-state gas corotates with the galaxy disk and often at sub-centrifugal velocities, suggesting that the gas is spiraling towards the galaxy disk. However, while observations ubiquitous…
View article: Where is the Supervirial Gas? The Supply from Hot Inflows
Where is the Supervirial Gas? The Supply from Hot Inflows Open
To understand the presence of the supervirial temperature gas detected in the Milky Way (MW), we present our findings from isolated galaxy simulations of MW-mass systems using GIZMO with the Feedback in Realistic Environments (FIRE-2) stel…
View article: The Physical Origin of Positive Metallicity Radial Gradients in High-redshift Galaxies: Insights from the FIRE-2 Cosmological Hydrodynamic Simulations
The Physical Origin of Positive Metallicity Radial Gradients in High-redshift Galaxies: Insights from the FIRE-2 Cosmological Hydrodynamic Simulations Open
Using the FIRE-2 cosmological zoom-in simulations, we investigate the temporal evolution of gas-phase metallicity radial gradients of Milky Way–mass progenitors in the redshift range of 0.4 < z < 3. We pay special attention to the occurren…
View article: The Physical Origin of Positive Metallicity Radial Gradients in High-redshift Galaxies: Insights from the FIRE-2 Cosmological Hydrodynamic Simulations
The Physical Origin of Positive Metallicity Radial Gradients in High-redshift Galaxies: Insights from the FIRE-2 Cosmological Hydrodynamic Simulations Open
Using the FIRE-2 cosmological zoom-in simulations, we investigate the temporal evolution of gas-phase metallicity radial gradients of Milky Way–mass progenitors in the redshift range of 0.4 < z < 3. We pay special attention to the occurren…
View article: Cooling flows as a reference solution for the hot circumgalactic medium
Cooling flows as a reference solution for the hot circumgalactic medium Open
The circumgalactic medium (CGM) in $\gtrsim 10^{12}\ \mathrm{M}_{\odot }$ haloes is dominated by a hot phase ($T \gtrsim 10^{6}$ K). While many models exist for the hot gas structure, there is as yet no consensus. We compare cooling flow m…
View article: Comparing enhanced natural recovery and enhanced natural recovery with activated carbon: a case study in the Lower Duwamish Waterway
Comparing enhanced natural recovery and enhanced natural recovery with activated carbon: a case study in the Lower Duwamish Waterway Open
The use of activated carbon (AC) to augment enhanced natural recovery (ENR) is an increasingly recognized remedy to reduce the bioavailability of hydrophobic, bioaccumulative compounds. The U.S. Environmental Protection Agency (USEPA) and …
View article: The Perfect and Legitimate Bribe: A Constitutional Path to Eternal Presidency
The Perfect and Legitimate Bribe: A Constitutional Path to Eternal Presidency Open
View article: Cooling Flows as a Reference Solution for the Hot Circumgalactic Medium
Cooling Flows as a Reference Solution for the Hot Circumgalactic Medium Open
The circumgalactic medium (CGM) in $\gtrsim 10^{12}$ $\mathrm{M}_{\odot}$ halos is dominated by a hot phase ($T \gtrsim 10^{6}$ K). While many models exist for the hot gas structure, there is as yet no consensus. We compare cooling flow mo…
View article: Where is the Super-Virial Gas? The Supply from hot inflows
Where is the Super-Virial Gas? The Supply from hot inflows Open
In an effort to understand the presence of super-virial gas detected in the Milky Way, we present our findings from isolated galaxy simulations of Milky Way-like systems using GIZMO with the FIRE-2 (Feedback In Realistic Environments) stel…
View article: Ne viii in the Warm-hot Circumgalactic Medium of FIRE Simulations and in Observations
Ne viii in the Warm-hot Circumgalactic Medium of FIRE Simulations and in Observations Open
The properties of warm-hot gas around ∼ L * galaxies can be studied with absorption lines from highly ionized metals. We predict Ne viii column densities from cosmological zoom-in simulations of halos with masses in ∼10 12 and ∼10 13 M ☉ f…
View article: Comparison of models for the warm-hot circumgalactic medium around Milky Way-like galaxies
Comparison of models for the warm-hot circumgalactic medium around Milky Way-like galaxies Open
A systematic comparison of the models of the circumgalactic medium (CGM) and their observables is crucial to understanding the predictive power of the models and constraining physical processes that affect the thermodynamics of CGM. This p…
View article: Comparison of Models for the Warm-Hot Circumgalactic Medium around Milky Way-like Galaxies
Comparison of Models for the Warm-Hot Circumgalactic Medium around Milky Way-like Galaxies Open
A systematic comparison of the models of the circumgalactic medium (CGM) and their observables is crucial to understanding the predictive power of the models and constraining physical processes that affect the thermodynamics of CGM. This p…
View article: X-ray signatures of galactic outflows into the circumgalactic medium
X-ray signatures of galactic outflows into the circumgalactic medium Open
We present a set of controlled hydrodynamical simulations to study the effects of strong galactic outflows on the density and temperature structures, and associated X-ray signatures, of extra-planar and circumgalactic gas. We consider thre…
View article: X-ray signatures of galactic outflows into the circumgalactic medium
X-ray signatures of galactic outflows into the circumgalactic medium Open
We present a set of controlled hydrodynamical simulations to study the effects of strong galactic outflows on the density and temperature structures, and associated X-ray signatures, of extra-planar and circumgalactic gas. We consider thre…
View article: Properties of the Line-of-sight Velocity Field in the Hot and X-Ray-emitting Circumgalactic Medium of Nearby Simulated Disk Galaxies
Properties of the Line-of-sight Velocity Field in the Hot and X-Ray-emitting Circumgalactic Medium of Nearby Simulated Disk Galaxies Open
The hot, X-ray-emitting phase of the circumgalactic medium of massive galaxies is believed to be the reservoir of baryons from which gas flows onto the central galaxy and into which feedback from active galactic nuclei and stars inject mas…
View article: Accretion onto disc galaxies via hot and rotating CGM inflows
Accretion onto disc galaxies via hot and rotating CGM inflows Open
Observed accretion rates onto the Milky Way and other local spirals fall short of that required to sustain star formation for cosmological timescales. A potential avenue for this unseen accretion is a rotating inflow in the volume-filling …
View article: Ne VIII in the warm-hot circumgalactic medium of FIRE simulations and in observations
Ne VIII in the warm-hot circumgalactic medium of FIRE simulations and in observations Open
The properties of warm-hot gas around $\sim L_{*}$ galaxies can be studied with absorption lines from highly ionized metals. We predict Ne VIII column densities from cosmological zoom-in simulations of halos with masses in $\sim 10^{12}$ a…
View article: The Halo21 absorption modelling challenge: lessons from ‘observing’ synthetic circumgalactic absorption spectra
The Halo21 absorption modelling challenge: lessons from ‘observing’ synthetic circumgalactic absorption spectra Open
In the Halo21 absorption modelling challenge we generated synthetic absorption spectra of the circumgalactic medium (CGM), and attempted to estimate the metallicity, temperature, and density (Z, T, and nH) of the underlying gas using obser…
View article: Constraining the driving mechanism of galaxy-scale winds with emission line spectra
Constraining the driving mechanism of galaxy-scale winds with emission line spectra Open
Using hydrodynamic simulations and photoionization calculations, we demonstrate that quasar emission line spectra contain information on the driving mechanism of galaxy-scale outflows. Outflows driven by a hot shocked bubble are expected t…
View article: <scp>Arkenstone</scp> – I. A novel method for robustly capturing high specific energy outflows in cosmological simulations
<span>Arkenstone</span> – I. A novel method for robustly capturing high specific energy outflows in cosmological simulations Open
Arkenstone is a new model for multiphase, stellar feedback-driven galactic winds designed for inclusion in coarse resolution cosmological simulations. In this first paper of a series, we describe the features that allow Arkenstone to prope…
View article: A Unified Model for the Coevolution of Galaxies and Their Circumgalactic Medium: The Relative Roles of Turbulence and Atomic Cooling Physics
A Unified Model for the Coevolution of Galaxies and Their Circumgalactic Medium: The Relative Roles of Turbulence and Atomic Cooling Physics Open
The circumgalactic medium (CGM) plays a pivotal role in regulating gas flows around galaxies and thus shapes their evolution. However, the details of how galaxies and their CGM coevolve remain poorly understood. We present a new time-depen…
View article: Supplementary movies for "A unified model for the co-evolution of galaxies and their circumgalactic medium: the relative roles of turbulence and atomic cooling physics"
Supplementary movies for "A unified model for the co-evolution of galaxies and their circumgalactic medium: the relative roles of turbulence and atomic cooling physics" Open
================================================================================ Title: A unified model for the co-evolution of galaxies and their circumgalactic medium: the relative roles of turbulence and atomic cooling physics Authors:…