A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Motivated by the recently discovered kinematic 'Hubble sequence' shown by the stellar orbit-circularity distribution of 260 CALIFA galaxies, we make use of a comparable galaxy sample at z...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Oxford University Press (OUP)
2022
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| Online Access: | https://hdl.handle.net/1721.1/132528.2 |
| _version_ | 1811075787910021120 |
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| author | Xu, Dandan Zhu, Ling Grand, Robert Springel, Volker Mao, Shude van de Ven, Glenn Lu, Shengdong Wang, Yougang Pillepich, Annalisa Genel, Shy Nelson, Dylan Rodriguez-Gomez, Vicente Pakmor, Rüdiger Weinberger, Rainer Marinacci, Federico Vogelsberger, Mark Torrey, Paul Naiman, Jill Hernquist, Lars |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Xu, Dandan Zhu, Ling Grand, Robert Springel, Volker Mao, Shude van de Ven, Glenn Lu, Shengdong Wang, Yougang Pillepich, Annalisa Genel, Shy Nelson, Dylan Rodriguez-Gomez, Vicente Pakmor, Rüdiger Weinberger, Rainer Marinacci, Federico Vogelsberger, Mark Torrey, Paul Naiman, Jill Hernquist, Lars |
| author_sort | Xu, Dandan |
| collection | MIT |
| description | © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Motivated by the recently discovered kinematic 'Hubble sequence' shown by the stellar orbit-circularity distribution of 260 CALIFA galaxies, we make use of a comparable galaxy sample at z = 0 with a stellar mass range of M∗/M☉ ∈ [109.7, 1011.4] selected from the IllustrisTNG simulation and study their stellar orbit compositions in relation to a number of other fundamental galaxy properties. We find that the TNG100 simulation broadly reproduces the observed fractions of different orbital components and their stellar mass dependences. In particular, the mean mass dependences of the luminosity fractions for the kinematically warm and hot orbits are well reproduced within model uncertainties of the observed galaxies. The simulation also largely reproduces the observed peak and trough features at M∗ ≈ 1-2 × 1010 M☉ in the mean distributions of the cold- and hot-orbit fractions, respectively, indicating fewer cooler orbits and more hotter orbits in both more- and less-massive galaxies beyond such a mass range. Several marginal disagreements are seen between the simulation and observations: the average cold-orbit (counter-rotating) fractions of the simulated galaxies below (above) M∗ ≈ 6 × 1010 M☉ are systematically higher than the observational data by ≾ 10 per cent (absolute orbital fraction); the simulation also seems to produce more scatter for the cold-orbit fraction and less so for the non-cold orbits at any given galaxy mass. Possible causes that stem from the adopted heating mechanisms are discussed. |
| first_indexed | 2024-09-23T10:11:52Z |
| format | Article |
| id | mit-1721.1/132528.2 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:11:52Z |
| publishDate | 2022 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/132528.22022-08-19T15:56:36Z A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations Xu, Dandan Zhu, Ling Grand, Robert Springel, Volker Mao, Shude van de Ven, Glenn Lu, Shengdong Wang, Yougang Pillepich, Annalisa Genel, Shy Nelson, Dylan Rodriguez-Gomez, Vicente Pakmor, Rüdiger Weinberger, Rainer Marinacci, Federico Vogelsberger, Mark Torrey, Paul Naiman, Jill Hernquist, Lars Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Motivated by the recently discovered kinematic 'Hubble sequence' shown by the stellar orbit-circularity distribution of 260 CALIFA galaxies, we make use of a comparable galaxy sample at z = 0 with a stellar mass range of M∗/M☉ ∈ [109.7, 1011.4] selected from the IllustrisTNG simulation and study their stellar orbit compositions in relation to a number of other fundamental galaxy properties. We find that the TNG100 simulation broadly reproduces the observed fractions of different orbital components and their stellar mass dependences. In particular, the mean mass dependences of the luminosity fractions for the kinematically warm and hot orbits are well reproduced within model uncertainties of the observed galaxies. The simulation also largely reproduces the observed peak and trough features at M∗ ≈ 1-2 × 1010 M☉ in the mean distributions of the cold- and hot-orbit fractions, respectively, indicating fewer cooler orbits and more hotter orbits in both more- and less-massive galaxies beyond such a mass range. Several marginal disagreements are seen between the simulation and observations: the average cold-orbit (counter-rotating) fractions of the simulated galaxies below (above) M∗ ≈ 6 × 1010 M☉ are systematically higher than the observational data by ≾ 10 per cent (absolute orbital fraction); the simulation also seems to produce more scatter for the cold-orbit fraction and less so for the non-cold orbits at any given galaxy mass. Possible causes that stem from the adopted heating mechanisms are discussed. 2022-07-19T18:38:54Z 2021-09-20T18:22:51Z 2022-07-19T18:38:54Z 2019 2020-11-12T16:27:31Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/132528.2 en 10.1093/MNRAS/STZ2164 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/octet-stream Oxford University Press (OUP) arXiv |
| spellingShingle | Xu, Dandan Zhu, Ling Grand, Robert Springel, Volker Mao, Shude van de Ven, Glenn Lu, Shengdong Wang, Yougang Pillepich, Annalisa Genel, Shy Nelson, Dylan Rodriguez-Gomez, Vicente Pakmor, Rüdiger Weinberger, Rainer Marinacci, Federico Vogelsberger, Mark Torrey, Paul Naiman, Jill Hernquist, Lars A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations |
| title | A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations |
| title_full | A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations |
| title_fullStr | A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations |
| title_full_unstemmed | A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations |
| title_short | A study of stellar orbit fractions: simulated IllustrisTNG galaxies compared to CALIFA observations |
| title_sort | study of stellar orbit fractions simulated illustristng galaxies compared to califa observations |
| url | https://hdl.handle.net/1721.1/132528.2 |
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