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Walking in the Pyrenees

Santi Roca Fabrega

Research engineer

Walking in the Pyrenees

The AGORA High-resolution Galaxy Simulations Comparison Project. VI. Similarities and Differences in the Circumgalactic Medium

Author

  • Clayton Strawn
  • Santi Roca-Fàbrega
  • Joel R. Primack
  • Ji Hoon Kim
  • Anna Genina
  • Loic Hausammann
  • Hyeonyong Kim
  • Alessandro Lupi
  • Kentaro Nagamine
  • Johnny W. Powell
  • Yves Revaz
  • Ikkoh Shimizu
  • Héctor Velázquez
  • Tom Abel
  • Daniel Ceverino
  • Bili Dong
  • Minyong Jung
  • Thomas R. Quinn
  • Eun Jin Shin
  • Kirk S.S. Barrow
  • Avishai Dekel
  • Boon Kiat Oh
  • Nir Mandelker
  • Romain Teyssier
  • Cameron Hummels
  • Soumily Maji
  • Antonio Man
  • Paul Mayerhofer
Show all

Summary, in English

We analyze the circumgalactic medium (CGM) for eight commonly-used cosmological codes in the AGORA collaboration. The codes are calibrated to use identical initial conditions, cosmology, heating and cooling, and star formation thresholds, but each evolves with its own unique code architecture and stellar feedback implementation. Here, we analyze the results of these simulations in terms of the structure, composition, and phase dynamics of the CGM. We show properties such as metal distribution, ionization levels, and kinematics are effective tracers of the effects of the different code feedback and implementation methods, and as such they can be highly divergent between simulations. This is merely a fiducial set of models, against which we will in the future compare multiple feedback recipes for each code. Nevertheless, we find that the large parameter space these simulations establish can help disentangle the different variables that affect observable quantities in the CGM, e.g., showing that abundances for ions with higher ionization energy are more strongly determined by the simulation’s metallicity, while abundances for ions with lower ionization energy are more strongly determined by the gas density and temperature.

Department/s

  • Astrophysics

Publishing year

2024-02

Language

English

Publication/Series

Astrophysical Journal

Volume

962

Issue

1

Document type

Journal article

Publisher

American Astronomical Society

Topic

  • Astronomy, Astrophysics and Cosmology

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-637X