The role of mergers in driving morphological transformation over cosmic time
Understanding the processes that trigger morphological transformation is central to understanding how and why the Universe transitions from being disc-dominated at early epochs to having the morphological mix that is observed today. We use Horizon-AGN, a cosmological hydrodynamical simulation, to pe...
| Principais autores: | , , , , |
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| Formato: | Journal article |
| Publicado em: |
Oxford University Press
2018
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| _version_ | 1826301286329352192 |
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| author | Martin, G Kaviraj, S Devriendt, J Dubois, Y Pichon, C |
| author_facet | Martin, G Kaviraj, S Devriendt, J Dubois, Y Pichon, C |
| author_sort | Martin, G |
| collection | OXFORD |
| description | Understanding the processes that trigger morphological transformation is central to understanding how and why the Universe transitions from being disc-dominated at early epochs to having the morphological mix that is observed today. We use Horizon-AGN, a cosmological hydrodynamical simulation, to perform a comprehensive study of the processes that drive morphological change in massive (M > 10^10 MSun) galaxies over cosmic time. We show that (1) essentially all the morphological evolution in galaxies that are spheroids at z=0 is driven by mergers with mass ratios greater than 1:10, (2) major mergers alone cannot produce today's spheroid population -- minor mergers are responsible for a third of all morphological transformation over cosmic time and are its dominant driver after z~1, (3) prograde mergers trigger milder morphological transformation than retrograde mergers -- while both types of events produce similar morphological changes at z>2, the average change due to retrograde mergers is around twice that due to their prograde counterparts at z~0, (4) remnant morphology depends strongly on the gas fraction of a merger, with gas-rich mergers routinely re-growing discs, and (5) at a given stellar mass, discs do not exhibit drastically different merger histories from spheroids -- disc survival in mergers is driven by acquisition of cold gas (via cosmological accretion and gas-rich interactions) and a preponderance of prograde mergers in their merger histories. |
| first_indexed | 2024-03-07T05:30:06Z |
| format | Journal article |
| id | oxford-uuid:e1f4550f-01f4-4d0a-81b0-53d3be342c8a |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:30:06Z |
| publishDate | 2018 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:e1f4550f-01f4-4d0a-81b0-53d3be342c8a2022-03-27T09:57:55ZThe role of mergers in driving morphological transformation over cosmic timeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e1f4550f-01f4-4d0a-81b0-53d3be342c8aSymplectic Elements at OxfordOxford University Press2018Martin, GKaviraj, SDevriendt, JDubois, YPichon, CUnderstanding the processes that trigger morphological transformation is central to understanding how and why the Universe transitions from being disc-dominated at early epochs to having the morphological mix that is observed today. We use Horizon-AGN, a cosmological hydrodynamical simulation, to perform a comprehensive study of the processes that drive morphological change in massive (M > 10^10 MSun) galaxies over cosmic time. We show that (1) essentially all the morphological evolution in galaxies that are spheroids at z=0 is driven by mergers with mass ratios greater than 1:10, (2) major mergers alone cannot produce today's spheroid population -- minor mergers are responsible for a third of all morphological transformation over cosmic time and are its dominant driver after z~1, (3) prograde mergers trigger milder morphological transformation than retrograde mergers -- while both types of events produce similar morphological changes at z>2, the average change due to retrograde mergers is around twice that due to their prograde counterparts at z~0, (4) remnant morphology depends strongly on the gas fraction of a merger, with gas-rich mergers routinely re-growing discs, and (5) at a given stellar mass, discs do not exhibit drastically different merger histories from spheroids -- disc survival in mergers is driven by acquisition of cold gas (via cosmological accretion and gas-rich interactions) and a preponderance of prograde mergers in their merger histories. |
| spellingShingle | Martin, G Kaviraj, S Devriendt, J Dubois, Y Pichon, C The role of mergers in driving morphological transformation over cosmic time |
| title | The role of mergers in driving morphological transformation over cosmic time |
| title_full | The role of mergers in driving morphological transformation over cosmic time |
| title_fullStr | The role of mergers in driving morphological transformation over cosmic time |
| title_full_unstemmed | The role of mergers in driving morphological transformation over cosmic time |
| title_short | The role of mergers in driving morphological transformation over cosmic time |
| title_sort | role of mergers in driving morphological transformation over cosmic time |
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