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Title: High Angular Momentum Halo Gas: A Feedback and Code-independent Prediction of LCDM

Abstract

We investigate angular momentum acquisition in Milky Way-sized galaxies by comparing five high resolution zoom-in simulations, each implementing identical cosmological initial conditions but utilizing different hydrodynamic codes: Enzo, Art, Ramses, Arepo, and Gizmo-PSPH. Each code implements a distinct set of feedback and star formation prescriptions. We find that while many galaxy and halo properties vary between the different codes (and feedback prescriptions), there is qualitative agreement on the process of angular momentum acquisition in the galaxy’s halo. In all simulations, cold filamentary gas accretion to the halo results in ∼4 times more specific angular momentum in cold halo gas ( λ {sub cold} ≳ 0.1) than in the dark matter halo. At z > 1, this inflow takes the form of inspiraling cold streams that are co-directional in the halo of the galaxy and are fueled, aligned, and kinematically connected to filamentary gas infall along the cosmic web. Due to the qualitative agreement among disparate simulations, we conclude that the buildup of high angular momentum halo gas and the presence of these inspiraling cold streams are robust predictions of Lambda Cold Dark Matter galaxy formation, though the detailed morphology of these streams is significantly less certain. A growing body ofmore » observational evidence suggests that this process is borne out in the real universe.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Department of Mathematical Sciences, California Baptist University, 8432 Magnolia Ave., Riverside, CA 92504 (United States)
  2. Department of Physics, New York City College of Technology, 300 Jay St., Brooklyn, NY 11201 (United States)
  3. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)
  4. Center for Cosmology, Department of Physics and Astronomy, The University of California at Irvine, Irvine, CA 92697 (United States)
  5. Department of Astronomy, Columbia University, New York, NY 10027 (United States)
  6. Department of Physics, University of Oxford, The Denys Wilkinson Building, Keble Rd., Oxford OX1 3RH (United Kingdom)
  7. Zentrum für Astronomie der Universität Heidelberg, Institut für Theoretische Astrophysik, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany)
  8. Department of Physics, Center for Astrophysics and Space Sciences, University of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093 (United States)
  9. California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States)
  10. Department of Physics and Astronomy and CIERA, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208 (United States)
Publication Date:
OSTI Identifier:
22663441
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 843; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; COMPARATIVE EVALUATIONS; FEEDBACK; HYDRODYNAMICS; MILKY WAY; NONLUMINOUS MATTER; RESOLUTION; SIMULATION; STARS; STREAMS; UNIVERSE

Citation Formats

Stewart, Kyle R., Maller, Ariyeh H., Oñorbe, Jose, Bullock, James S., Joung, M. Ryan, Devriendt, Julien, Ceverino, Daniel, Kereš, Dušan, Hopkins, Philip F., and Faucher-Giguère, Claude-André. High Angular Momentum Halo Gas: A Feedback and Code-independent Prediction of LCDM. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6DFF.
Stewart, Kyle R., Maller, Ariyeh H., Oñorbe, Jose, Bullock, James S., Joung, M. Ryan, Devriendt, Julien, Ceverino, Daniel, Kereš, Dušan, Hopkins, Philip F., & Faucher-Giguère, Claude-André. High Angular Momentum Halo Gas: A Feedback and Code-independent Prediction of LCDM. United States. doi:10.3847/1538-4357/AA6DFF.
Stewart, Kyle R., Maller, Ariyeh H., Oñorbe, Jose, Bullock, James S., Joung, M. Ryan, Devriendt, Julien, Ceverino, Daniel, Kereš, Dušan, Hopkins, Philip F., and Faucher-Giguère, Claude-André. Sat . "High Angular Momentum Halo Gas: A Feedback and Code-independent Prediction of LCDM". United States. doi:10.3847/1538-4357/AA6DFF.
@article{osti_22663441,
title = {High Angular Momentum Halo Gas: A Feedback and Code-independent Prediction of LCDM},
author = {Stewart, Kyle R. and Maller, Ariyeh H. and Oñorbe, Jose and Bullock, James S. and Joung, M. Ryan and Devriendt, Julien and Ceverino, Daniel and Kereš, Dušan and Hopkins, Philip F. and Faucher-Giguère, Claude-André},
abstractNote = {We investigate angular momentum acquisition in Milky Way-sized galaxies by comparing five high resolution zoom-in simulations, each implementing identical cosmological initial conditions but utilizing different hydrodynamic codes: Enzo, Art, Ramses, Arepo, and Gizmo-PSPH. Each code implements a distinct set of feedback and star formation prescriptions. We find that while many galaxy and halo properties vary between the different codes (and feedback prescriptions), there is qualitative agreement on the process of angular momentum acquisition in the galaxy’s halo. In all simulations, cold filamentary gas accretion to the halo results in ∼4 times more specific angular momentum in cold halo gas ( λ {sub cold} ≳ 0.1) than in the dark matter halo. At z > 1, this inflow takes the form of inspiraling cold streams that are co-directional in the halo of the galaxy and are fueled, aligned, and kinematically connected to filamentary gas infall along the cosmic web. Due to the qualitative agreement among disparate simulations, we conclude that the buildup of high angular momentum halo gas and the presence of these inspiraling cold streams are robust predictions of Lambda Cold Dark Matter galaxy formation, though the detailed morphology of these streams is significantly less certain. A growing body of observational evidence suggests that this process is borne out in the real universe.},
doi = {10.3847/1538-4357/AA6DFF},
journal = {Astrophysical Journal},
number = 1,
volume = 843,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}