143 citations · 1k across the 27 of their papers we have counts for
27 papers
Shock-heated Away: The Impact of Radiative Cooling on Gas-Phase Transitions in Supernova Remnants
Zuzanna Kocjan, Benedikt Diemer, Vadim A. Semenov +2
Supernova (SN) feedback plays a central role in regulating the structure of the interstellar medium (ISM) through the injection of energy and momentum. The amount of hot gas produc…
The Rhythm of the ISM: Tracing the Timescales of Gas Evolution and Star Formation across Galactic Environments
Zuzanna Kocjan, Vadim A. Semenov
We investigate the physical origin of the star formation scaling relations between the gas depletion time, the star-forming gas mass fraction, and the gas surface density, $Σ_{\rm…
The effects of different cooling and heating function models on a simulated analog of NGC300
David Robinson, Camille Avestruz, Nickolay Y. Gnedin +1
Gas cooling and heating rates are vital components of hydrodynamic simulations. However, they are computationally expensive to evaluate exactly with chemical networks or photoioniz…
On the universality of star formation efficiency in galaxies
Ava Polzin, Andrey V. Kravtsov, Vadim A. Semenov +1
We analyze high-resolution hydrodynamics simulations of an isolated disk dwarf galaxy with an explicit model for unresolved turbulence and turbulence-based star formation prescript…
Modeling molecular hydrogen in low metallicity galaxies
Ava Polzin, Andrey V. Kravtsov, Vadim A. Semenov +1
We use a suite of hydrodynamics simulations of the interstellar medium (ISM) within a galactic disk, which include radiative transfer, a non-equilibrium model of molecular hydrogen…
Formation of Galactic Disks II: the Physical Drivers of Disk Spin-up
Vadim A. Semenov, Charlie Conroy, Vedant Chandra +2
Using a representative sample of Milky Way (MW)-like galaxies from the TNG50 cosmological simulation, we investigate physical processes driving the formation of galactic disks. A d…
Formation of Galactic Disks I: Why Did the Milky Way's Disk Form Unusually Early?
Vadim A. Semenov, Charlie Conroy, Vedant Chandra +2
Recent results from spectroscopic and astrometric surveys of nearby stars suggest that the stellar disk of our Milky Way (MW) was formed quite early, within the first few billion y…
Fitting Probability Distribution Functions in Turbulent Star-Forming Molecular Clouds
Avery Kiihne, Sabrina M. Appel, Blakesley Burkhart +2
We use a suite of 3D simulations of star-forming molecular clouds, with and without stellar feedback and magnetic fields, to investigate the effectiveness of different fitting meth…
The Uniqueness of the Gauss Image Measure
Vadim Semenov
We show that if the Gauss Image Measure of submeasure via convex body agrees with the Gauss Image Measure of via convex body , then the radial Gauss Image maps of th…
Clouds of Theseus: long-lived molecular clouds are composed of short-lived H2 molecules
Sarah M. R. Jeffreson, Vadim A. Semenov, Mark R. Krumholz
We use passive gas tracer particles in an Arepo simulation of a dwarf spiral galaxy to relate the Lagrangian evolution of star-forming gas parcels and their H2 molecules to the evo…
What Sets the Star Formation Rate of Molecular Clouds? The Density Distribution as a Fingerprint of Compression and Expansion Rates
Sabrina M. Appel, Blakesley Burkhart, Vadim A. Semenov +3
We use a suite of 3D simulations of star-forming molecular clouds, with and without stellar feedback, magnetic fields, and driven turbulence, to study the compression and expansion…
Star Formation Variability as a Probe for the Baryon Cycle within Galaxies
Eun-jin Shin, Sandro Tacchella, Ji-hoon Kim +2
We investigate the connection of the regulation of star formation and the cycling of baryons within and in and out of galaxies. We use idealized numerical simulations of Milky Way-…
The Gauss Image Problem with Weak Aleksandrov Condition
Vadim Semenov
We introduce a relaxation of the Aleksandrov condition for the Gauss Image Problem. This weaker condition turns out to be a necessary condition for two measures to be related by a…
The Effects of Magnetic Fields and Outflow Feedback on the Shape and Evolution of the Density PDF in Turbulent Star-Forming Clouds
Sabrina M. Appel, Blakesley Burkhart, Vadim A. Semenov +2
Using a suite of 3D hydrodynamical simulations of star-forming molecular clouds, we investigate how the density probability distribution function (PDF) changes when including gravi…
The Per-Tau Shell: A Giant Star-Forming Spherical Shell Revealed by 3D Dust Observations
Shmuel Bialy, Catherine Zucker, Alyssa Goodman +6
A major question in the field of star formation is how molecular clouds form out of the diffuse Interstellar Medium (ISM). Recent advances in 3D dust mapping are revolutionizing ou…
Entropy-Conserving Scheme for Modeling Nonthermal Energies in Fluid Dynamics Simulations
Vadim A. Semenov, Andrey V. Kravtsov, Benedikt Diemer
We compare the performance of energy-based and entropy-conserving schemes for modeling nonthermal energy components, such as unresolved turbulence and cosmic rays, using idealized…
Spatial Decorrelation of Young Stars and Dense Gas as a Probe of the Star Formation-Feedback Cycle in Galaxies
Vadim A. Semenov, Andrey V. Kravtsov, Nickolay Y. Gnedin
The spatial decorrelation of dense molecular gas and young stars observed on kiloparsec scales in nearby galaxies indicates rapid dispersal of star-forming regions by…
Cosmic-Ray Diffusion Suppression in Star-forming Regions Inhibits Clump Formation in Gas-rich Galaxies
Vadim A. Semenov, Andrey V. Kravtsov, Damiano Caprioli
Observations of the -ray emission around star clusters, isolated supernova remnants, and pulsar wind nebulae indicate that the cosmic-ray (CR) diffusion coefficient near acceler…
What Sets the Slope of the Molecular Kennicutt-Schmidt Relation?
Vadim A. Semenov, Andrey V. Kravtsov, Nickolay Y. Gnedin
The surface densities of molecular gas, , and the star formation rate (SFR), , correlate almost linearly on kiloparsec scales in observed star-forming (no…
How galaxies form stars: the connection between local and global star formation in galaxy simulations
Vadim A. Semenov, Andrey V. Kravtsov, Nickolay Y. Gnedin
Using a suite of isolated galaxy simulations, we show that global depletion times and star-forming gas mass fractions in simulated galaxies exhibit systematic and well-de…
Enforcing the Courant-Friedrichs-Lewy Condition in Explicitly Conservative Local Time Stepping Schemes
Nickolay Y. Gnedin, Vadim A. Semenov, Andrey V. Kravtsov
An optimally efficient explicit numerical scheme for solving fluid dynamics equations, or any other parabolic or hyperbolic system of partial differential equations, should allow l…
The physical origin of long gas depletion times in galaxies
Vadim A. Semenov, Andrey V. Kravtsov, Nickolay Y. Gnedin
We present a model that explains why galaxies form stars on a time scale significantly longer than the time scales of processes governing the evolution of interstellar gas. We show…
On conservative sequences and their application to ergodic multiplier problems
Madeleine Elyze, Alexander Kastner, Juan Ortiz Rhoton +2
The conservative sequence of a set under a transformation is the set of all such that . By studying these sequences, we…
The AGORA High-Resolution Galaxy Simulations Comparison Project. II: Isolated Disk Test
Ji-hoon Kim, Oscar Agertz, Romain Teyssier +40
Using an isolated Milky Way-mass galaxy simulation, we compare results from 9 state-of-the-art gravito-hydrodynamics codes widely used in the numerical community. We utilize the in…