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Title: Introducing CGOLS: The Cholla Galactic Outflow Simulation Suite

Abstract

Here, we present the Cholla Galactic OutfLow Simulations (CGOLS) suite, a set of extremely high resolution global simulations of isolated disk galaxies designed to clarify the nature of multiphase structure in galactic winds. Using the GPU-based code Cholla, we achieve unprecedented resolution in these simulations, modeling galaxies over a 20 kpc region at a constant resolution of 5 pc. The simulations include a feedback model designed to test the effects of different mass- and energy-loading factors on galactic outflows over kiloparsec scales. In addition to describing the simulation methodology in detail, we also present the results from an adiabatic simulation that tests the frequently adopted analytic galactic wind model of Chevalier & Clegg. Our results indicate that the Chevalier & Clegg model is a good fit to nuclear starburst winds in the nonradiative region of parameter space. Finally, we investigate the role of resolution and convergence in large-scale simulations of multiphase galactic winds. While our largest-scale simulations show convergence of observable features like soft X-ray emission, our tests demonstrate that simulations of this kind with resolutions greater than 10 pc are not yet converged, confirming the need for extreme resolution in order to study the structure of winds and theirmore » effects on the circumgalactic medium.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Princeton Univ., NJ (United States)
  2. Univ. of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565707
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 860; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; galaxies; evolution - galaxies; starburst - methods; numerical - x-rays

Citation Formats

Schneider, Evan E., and Robertson, Brant E. Introducing CGOLS: The Cholla Galactic Outflow Simulation Suite. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aac329.
Schneider, Evan E., & Robertson, Brant E. Introducing CGOLS: The Cholla Galactic Outflow Simulation Suite. United States. doi:10.3847/1538-4357/aac329.
Schneider, Evan E., and Robertson, Brant E. Wed . "Introducing CGOLS: The Cholla Galactic Outflow Simulation Suite". United States. doi:10.3847/1538-4357/aac329. https://www.osti.gov/servlets/purl/1565707.
@article{osti_1565707,
title = {Introducing CGOLS: The Cholla Galactic Outflow Simulation Suite},
author = {Schneider, Evan E. and Robertson, Brant E.},
abstractNote = {Here, we present the Cholla Galactic OutfLow Simulations (CGOLS) suite, a set of extremely high resolution global simulations of isolated disk galaxies designed to clarify the nature of multiphase structure in galactic winds. Using the GPU-based code Cholla, we achieve unprecedented resolution in these simulations, modeling galaxies over a 20 kpc region at a constant resolution of 5 pc. The simulations include a feedback model designed to test the effects of different mass- and energy-loading factors on galactic outflows over kiloparsec scales. In addition to describing the simulation methodology in detail, we also present the results from an adiabatic simulation that tests the frequently adopted analytic galactic wind model of Chevalier & Clegg. Our results indicate that the Chevalier & Clegg model is a good fit to nuclear starburst winds in the nonradiative region of parameter space. Finally, we investigate the role of resolution and convergence in large-scale simulations of multiphase galactic winds. While our largest-scale simulations show convergence of observable features like soft X-ray emission, our tests demonstrate that simulations of this kind with resolutions greater than 10 pc are not yet converged, confirming the need for extreme resolution in order to study the structure of winds and their effects on the circumgalactic medium.},
doi = {10.3847/1538-4357/aac329},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 860,
place = {United States},
year = {2018},
month = {6}
}

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