The inner structure of early-type galaxies in the Illustris simulation
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society Early-type galaxies provide unique tests for the predictions of the cold dark matter cosmology and the baryonic physics assumptions entering models for galaxy formation. In this work, we use the Illus...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Oxford University Press (OUP)
2021
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| Online Access: | https://hdl.handle.net/1721.1/134991 |
| _version_ | 1811098259449446400 |
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| author | Xu, Dandan Springel, Volker Sluse, Dominique Schneider, Peter Sonnenfeld, Alessandro Nelson, Dylan Vogelsberger, Mark Hernquist, Lars |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Xu, Dandan Springel, Volker Sluse, Dominique Schneider, Peter Sonnenfeld, Alessandro Nelson, Dylan Vogelsberger, Mark Hernquist, Lars |
| author_sort | Xu, Dandan |
| collection | MIT |
| description | © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society Early-type galaxies provide unique tests for the predictions of the cold dark matter cosmology and the baryonic physics assumptions entering models for galaxy formation. In this work, we use the Illustris simulation to study correlations of three main properties of early-type galaxies, namely the stellar orbital anisotropies, the central dark matter fractions and the central radial density slopes, as well as their redshift evolution since z = 1.0. We find that lower mass galaxies or galaxies at higher redshift tend to be bluer in rest-frame colour, have higher central gas fractions, and feature more tangentially anisotropic orbits and steeper central density slopes than their higher mass or lower redshift counterparts, respectively. The projected central dark matter fraction within the effective radius shows a very mild mass dependence but positively correlates with galaxy effective radii due to the aperture effect. The central density slopes obtained by combining strong lensing measurements with single-aperture kinematics are found to differ from the true density slopes. We identify systematic biases in this measurement to be due to two common modelling assumptions, isotropic stellar orbital distributions and power-law density profiles. We also compare the properties of early-type galaxies in Illustris to those from existing galaxy and strong lensing surveys; we find in general broad agreement but also some tension, which poses a potential challenge to the stellar formation and feedback models adopted by the simulation. |
| first_indexed | 2024-09-23T17:12:29Z |
| format | Article |
| id | mit-1721.1/134991 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T17:12:29Z |
| publishDate | 2021 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1349912024-01-02T19:08:38Z The inner structure of early-type galaxies in the Illustris simulation Xu, Dandan Springel, Volker Sluse, Dominique Schneider, Peter Sonnenfeld, Alessandro Nelson, Dylan Vogelsberger, Mark Hernquist, Lars Massachusetts Institute of Technology. Department of Physics © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society Early-type galaxies provide unique tests for the predictions of the cold dark matter cosmology and the baryonic physics assumptions entering models for galaxy formation. In this work, we use the Illustris simulation to study correlations of three main properties of early-type galaxies, namely the stellar orbital anisotropies, the central dark matter fractions and the central radial density slopes, as well as their redshift evolution since z = 1.0. We find that lower mass galaxies or galaxies at higher redshift tend to be bluer in rest-frame colour, have higher central gas fractions, and feature more tangentially anisotropic orbits and steeper central density slopes than their higher mass or lower redshift counterparts, respectively. The projected central dark matter fraction within the effective radius shows a very mild mass dependence but positively correlates with galaxy effective radii due to the aperture effect. The central density slopes obtained by combining strong lensing measurements with single-aperture kinematics are found to differ from the true density slopes. We identify systematic biases in this measurement to be due to two common modelling assumptions, isotropic stellar orbital distributions and power-law density profiles. We also compare the properties of early-type galaxies in Illustris to those from existing galaxy and strong lensing surveys; we find in general broad agreement but also some tension, which poses a potential challenge to the stellar formation and feedback models adopted by the simulation. 2021-10-27T20:10:12Z 2021-10-27T20:10:12Z 2017 2019-06-13T12:01:33Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134991 en 10.1093/MNRAS/STX899 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 (OUP) arXiv |
| spellingShingle | Xu, Dandan Springel, Volker Sluse, Dominique Schneider, Peter Sonnenfeld, Alessandro Nelson, Dylan Vogelsberger, Mark Hernquist, Lars The inner structure of early-type galaxies in the Illustris simulation |
| title | The inner structure of early-type galaxies in the Illustris simulation |
| title_full | The inner structure of early-type galaxies in the Illustris simulation |
| title_fullStr | The inner structure of early-type galaxies in the Illustris simulation |
| title_full_unstemmed | The inner structure of early-type galaxies in the Illustris simulation |
| title_short | The inner structure of early-type galaxies in the Illustris simulation |
| title_sort | inner structure of early type galaxies in the illustris simulation |
| url | https://hdl.handle.net/1721.1/134991 |
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