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The large-scale environment from cosmological simulations II: The redshift evolution and distributions of baryons

Research output: Contribution to journalArticle

  • Weiguang Cui
  • Alexander Knebe
  • Noam I. Libeskind
  • Susana Planelles
  • Xiaohu Yang
  • Wei Cui
  • Romeel Davé
  • Xi Kang
  • Robert Mostoghiu
  • Lister Staveley-Smith
  • Huiyuan Wang
  • Peng Wang
  • Gustavo Yepes

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Original languageEnglish
Pages (from-to)2367-2379
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date26 Feb 2019
Publication statusPublished - 1 May 2019


Following Cui et al. (2018; hereafter Paper I) on the classification of large-scale environments (LSE) at z = 0, we push our analysis to higher redshifts and study the evolution of LSE and the baryon distributions in them. Our aim is to investigate how baryons affect the LSE as a function of redshift. In agreement with Paper I, the baryon models have negligible effect on the LSE overall investigated redshifts. We further validate the conclusion obtained in Paper I that the gas web is an unbiased tracer of total matter - even better at high redshifts. By separating the gas mainly by temperature, we find that about 40 per cent of gas is in the so-called warm-hot intergalactic medium (WHIM). This fraction of gas mass in theWHIM decreases with redshift, especially from z=1 (29 per cent) to z=2.1 (10 per cent). By separating the whole WHIM gas mass into the four large-scale environments (i.e. voids, sheets, filaments, and knots), we find that about half of the WHIM gas is located in filaments. Although the total gas mass inWHIM decreases with redshift, the WHIM mass fractions in the different LSE seem unchanged.

    Research areas

  • Cosmology: miscellaneous, Large-scale structure of Universe

ID: 145361393