A5017005527- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Advanced Data Storage Technologies
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Simulation Techniques and Applications
- Atmospheric and Environmental Gas Dynamics
- Photovoltaic System Optimization Techniques
- Statistical and numerical algorithms
- Astro and Planetary Science
- Computational Physics and Python Applications
- Solar Radiation and Photovoltaics
- Meteorological Phenomena and Simulations
- Astrophysical Phenomena and Observations
- Scientific Computing and Data Management
- Micro and Nano Robotics
- Impact of Light on Environment and Health
- Real-time simulation and control systems
- Remote Sensing in Agriculture
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Frequency and Time Standards
- Fluid Dynamics and Turbulent Flows
Quansight (United States)
2024
National Center for Supercomputing Applications
2015-2021
University of Illinois Urbana-Champaign
2015-2021
University of California, Santa Cruz
2011-2015
UK Astronomy Technology Centre
2014
University of Edinburgh
2014
Laboratory for Atmospheric and Space Physics
2009
University of Colorado Boulder
2009
Ben-Gurion University of the Negev
2000
This paper describes the open-source code Enzo, which uses block-structured adaptive mesh refinement to provide high spatial and temporal resolution for modeling astrophysical fluid flows. The is Cartesian, can be run in one, two, three dimensions, supports a wide variety of physics including hydrodynamics, ideal non-ideal magnetohydrodynamics, N-body dynamics (and, more broadly, self-gravity fluids particles), primordial gas chemistry, optically thin radiative cooling metal-enriched plasmas...
We present the Grackle chemistry and cooling library for astrophysical simulations models. provides a treatment of non-equilibrium primordial H, D, He species, including H2 formation on dust grains; tabulated metal cooling; multiple UV background models; support radiation transfer arbitrary heat sources. The has an easily implementable interface simulation codes written in C, C++, Fortran as well Python with added convenience functions semi-analytical As open-source project, community...
We introduce the AGORA project, a comprehensive numerical study of well-resolved galaxies within LCDM cosmology. Cosmological hydrodynamic simulations with force resolutions ~100 proper pc or better will be run variety code platforms to follow hierarchical growth, star formation history, morphological transformation, and cycle baryons in out 8 halo masses M_vir ~= 1e10, 1e11, 1e12, 1e13 Msun at z=0 two different ("violent" "quiescent") assembly histories. The techniques implementations used...
We present the first stable release of Halotools (v0.2), a community-driven Python package designed to build and test models galaxy-halo connection. provides modular platform for creating mock universes galaxies starting from catalog dark matter halos obtained cosmological simulation. The supports many common forms used describe models: halo occupation distribution (HOD), conditional luminosity function (CLF), abundance matching, alternatives these that include effects such as environmental...
We present virial models for the global evolution of giant molecular clouds (GMCs). Focusing on presence an accretion flow and accounting amount mass, momentum, energy supplied by star formation feedback, we are able to follow growth, evolution, dispersal individual GMCs. Our model reproduce scaling relations observed in both galactic extragalactic clouds. find that contribute roughly equal amounts turbulent kinetic over lifetime cloud. Clouds attain equilibrium grow such a way as maintain...
We present gamer-2, a GPU-accelerated adaptive mesh refinement (AMR) code for astrophysics. It provides rich set of features, including time-stepping, several hydrodynamic schemes, magnetohydrodynamics, self-gravity, particles, star formation, chemistry, and radiative processes with grackle, data analysis yt, memory pool efficient object allocation. gamer-2 is fully bitwise reproducible. For the performance optimization, it adopts hybrid OpenMP/MPI/GPU parallelization utilizes overlapping...
Enzo (Enzo Developers, 2019a) is a block-structured adaptive mesh refinement code that widely used to simulate astrophysical fluid flows (primarily, but not exclusively, cosmological structure formation, star and turbulence).The community project with dozens of users, has contributed hundreds peer-reviewed publications in astrophysics, physics, computer science.The utilizes Cartesian can be run one, two, or
The role of gravitational instability-driven turbulence in determining the structure and evolution disk galaxies, extent to which gravity rather than feedback can explain galaxy properties, remains an open question. To address it, we present high-resolution adaptive mesh refinement simulations Milky Way-like isolated including realistic heating cooling rates a physically motivated prescription for star formation, but no form formation feedback. After initial transient, our galaxies reach...
ABSTRACT Using an isolated Milky Way-mass galaxy simulation, we compare results from nine state-of-the-art gravito-hydrodynamics codes widely used in the numerical community. We utilize infrastructure have built for AGORA High-resolution Galaxy Simulations Comparison Project. This includes common disk initial conditions, physics models (e.g., radiative cooling and UV background by standardized package Grackle ) analysis toolkit yt , all of which are publicly available. Subgrid such as Jeans...
Metal production in galaxies traces star formation, and is highly concentrated towards the centres of galactic discs. This suggests that should have inhomogeneous metal distributions with strong radial gradients, but observations present-day show only shallow gradients little azimuthal variation, implying existence a redistribution mechanism. We study role gravitational instability-driven turbulence as mixing mechanism by simulating an isolated disc at high resolution, including fields...
ABSTRACT Self-gravity and stellar feedback are capable of driving turbulence transporting mass angular momentum in disk galaxies, but the balance between them is not well understood. In previous paper this series, we showed that gravity alone can drive galactic disks, regulate their Toomre Q parameters to ∼1, transport inwards at a rate sufficient fuel star formation centers present-day galaxies. extend our models include effects feedback. We show suppresses galaxies’ rates by factor ∼5...
We describe a new method for simulating ionizing radiation and supernova feedback in the analogs of low-redshift galactic disks. In this method, which we call star-forming molecular cloud (SFMC) particles, use ray-tracing technique to solve radiative transfer equation ultraviolet photons emitted by thousands distinct particles on fly. Joined with high numerical resolution 3.8 pc, realistic description stellar helps self-regulate star formation. This scheme also enables us study escape from...
Metallicity gradients are important diagnostics of galaxy evolution, because they record the history events such as mergers, gas inflow and star-formation. However, accuracy with which can be measured is limited by spatial resolution noise, hence measurements need to corrected for effects. We use high (~20 pc) simulation a face-on Milky Way mass galaxy, coupled photoionisation models, produce suite synthetic integral field spectroscopy (IFS) datacubes. then degrade datacubes, range realistic...
We investigate the spatially-resolved star formation relation using a galactic disk formed in comprehensive high-resolution (3.8 pc) simulation. Our new implementation of stellar feedback includes ionizing radiation as well supernova explosions, and we handle by solving radiative transfer equation rather than subgrid model. Photoheating stabilizes gas against Jeans fragmentation, reducing rate. Because have self-consistently calculated location ionized gas, are able to make mock observations...
We have measured the average radial (cell center to network boundary) profile of continuum intensity contrast associated with supergranular flows using data from Precision Solar Photometric Telescope (PSPT) at Mauna Loa Observatory (MLSO). After removing contribution flux elements by application masks based on Ca II K and averaging over more than 10^5 cells, we find a ~ 0.1% decrease in red blue cell centers outward, corresponding 1.0 brightness temperature across cells. The may be caused...
Software that processes real-world data or models a physical system must have some way of managing units.This might be as simple the convention all floating point numbers are understood to in same unit (for example, SI MKS units system).While approaches like this do work practice, they also fraught with possible error, both by programmers modifying code who unintentionally misinterpret units, and users software take care supply correct need infer returned software.Famously, NASA lost contact...
Simulations inform all aspects of modern astrophysical research, ranging in scale from 1D and 2D test problems that can run seconds on an astronomer's laptop the way to large-scale 3D calculations largest supercomputers, with a spectrum data sizes shapes filling landscape between these two extremes. I review diversity astrophysics simulation formats commonly use by researchers, providing overview most common techniques, including pure N-body dynamics, smoothed particle hydrodynamics (SPH),...