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Large-scale mass distribution in the Illustris simulation

Haider, M. and Steinhauser, D. and Vogelsberger, M. and Genel, S. and Springel, V. and Torrey, P. and Hernquist, L. (2016) Large-scale mass distribution in the Illustris simulation. Monthly Notices of the Royal Astronomical Society, 457 (3). pp. 3024-3035. ISSN 0035-8711.

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Observations at low redshifts thus far fail to account for all of the baryons expected in the Universe according to cosmological constraints. A large fraction of the baryons presumably resides in a thin and warm–hot medium between the galaxies, where they are difficult to observe due to their low densities and high temperatures. Cosmological simulations of structure formation can be used to verify this picture and provide quantitative predictions for the distribution of mass in different large-scale structure components. Here we study the distribution of baryons and dark matter at different epochs using data from the Illustris simulation. We identify regions of different dark matter density with the primary constituents of large-scale structure, allowing us to measure mass and volume of haloes, filaments and voids. At redshift zero, we find that 49 per cent of the dark matter and 23 per cent of the baryons are within haloes more massive than the resolution limit of 2 × 108 M⊙. The filaments of the cosmic web host a further 45 per cent of the dark matter and 46 per cent of the baryons. The remaining 31 per cent of the baryons reside in voids. The majority of these baryons have been transported there through active galactic nuclei feedback. We note that the feedback model of Illustris is too strong for heavy haloes, therefore it is likely that we are overestimating this amount. Categorizing the baryons according to their density and temperature, we find that 17.8 per cent of them are in a condensed state, 21.6 per cent are present as cold, diffuse gas, and 53.9 per cent are found in the state of a warm–hot intergalactic medium.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1093/mnras/stw077DOIArticle Paper
Vogelsberger, M.0000-0001-8593-7692
Genel, S.0000-0002-3185-1540
Springel, V.0000-0001-5976-4599
Torrey, P.0000-0002-5653-0786
Hernquist, L.0000-0001-6950-1629
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 January 8. Received 2015 December 21. In original form 2015 August 6. First published online February 24, 2016. MH and DS thank their colleagues at the Institute for Astro- and Particle Physics at the University of Innsbruck for usefull discussions, especially Francine Marleau, Dominic Clancy, Rebecca Habas and Matteo Bianconi. DS acknowledges the research grant from the office of the vice rector for research of the University of Innsbruck (project DB: 194272) and the doctoral school – Computational Interdisciplinary Modelling FWF DK-plus (W1227). This work was supported by the Austrian Federal Ministry of Science, Research and Economy as part of the UniInfrastrukturprogramm of the Focal Point Scientific Computing at the University of Innsbruck. SG acknowledges support provided by NASA through Hubble Fellowship grant HST-HF2-51341.001-A awarded by the STScI, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. VS acknowledges support through the European Research Council through ERC-StG grant EXAGAL-308037.
Funding AgencyGrant Number
University of Innsbruck194272
University of InnsbruckW1227
Das Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW)UNSPECIFIED
NASA Hubble FellowshipHST-HF2-51341.001-A
European Research Council (ERC)EXAGAL-308037
Subject Keywords:galaxies: haloes dark matter large-scale structure of Universe
Issue or Number:3
Record Number:CaltechAUTHORS:20160509-094508443
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Official Citation:M. Haider, D. Steinhauser, M. Vogelsberger, S. Genel, V. Springel, P. Torrey, and L. Hernquist Large-scale mass distribution in the Illustris simulation MNRAS (April 11, 2016) Vol. 457 3024-3035 doi:10.1093/mnras/stw077 First published online February 24, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66733
Deposited By: Ruth Sustaita
Deposited On:09 May 2016 17:56
Last Modified:09 Mar 2020 13:19

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