Large-scale mass distribution in the Illustris simulation
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 de...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/1721.1/108540 https://orcid.org/0000-0001-8593-7692 https://orcid.org/0000-0002-5653-0786 |
| _version_ | 1811075638335897600 |
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| author | Haider, M. Steinhauser, D. Genel, S. Springel, V. Hernquist, L. Vogelsberger, Mark Torrey, Paul A. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Haider, M. Steinhauser, D. Genel, S. Springel, V. Hernquist, L. Vogelsberger, Mark Torrey, Paul A. |
| author_sort | Haider, M. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:09:36Z |
| format | Article |
| id | mit-1721.1/108540 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:09:36Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | mit-1721.1/1085402022-09-26T16:07:42Z Large-scale mass distribution in the Illustris simulation Haider, M. Steinhauser, D. Genel, S. Springel, V. Hernquist, L. Vogelsberger, Mark Torrey, Paul A. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Vogelsberger, Mark Torrey, Paul A. 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. 2017-05-01T17:47:41Z 2017-05-01T17:47:41Z 2016-01 2015-12 Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 http://hdl.handle.net/1721.1/108540 Haider, M.; Steinhauser, D.; Vogelsberger, M.; Genel, S.; Springel, V.; Torrey, P. and Hernquist, L. “Large-Scale Mass Distribution in the Illustris Simulation.” Monthly Notices of the Royal Astronomical Society 457, no. 3 (February 24, 2016): 3024–3035. https://orcid.org/0000-0001-8593-7692 https://orcid.org/0000-0002-5653-0786 en_US http://dx.doi.org/10.1093/mnras/stw077 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press arXiv |
| spellingShingle | Haider, M. Steinhauser, D. Genel, S. Springel, V. Hernquist, L. Vogelsberger, Mark Torrey, Paul A. Large-scale mass distribution in the Illustris simulation |
| title | Large-scale mass distribution in the Illustris simulation |
| title_full | Large-scale mass distribution in the Illustris simulation |
| title_fullStr | Large-scale mass distribution in the Illustris simulation |
| title_full_unstemmed | Large-scale mass distribution in the Illustris simulation |
| title_short | Large-scale mass distribution in the Illustris simulation |
| title_sort | large scale mass distribution in the illustris simulation |
| url | http://hdl.handle.net/1721.1/108540 https://orcid.org/0000-0001-8593-7692 https://orcid.org/0000-0002-5653-0786 |
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