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dc.contributor.authorMartin, G.
dc.contributor.authorKaviraj, S.
dc.contributor.authorDevriendt, J. E. G.
dc.contributor.authorDubois, Y.
dc.contributor.authorPichon, C.
dc.date.accessioned2018-08-20T11:06:04Z
dc.date.available2018-08-20T11:06:04Z
dc.date.issued2018-10-01
dc.identifier.citationMartin , G , Kaviraj , S , Devriendt , J E G , Dubois , Y & Pichon , C 2018 , ' The role of mergers in driving morphological transformation over cosmic time ' , Monthly Notices of the Royal Astronomical Society , vol. 480 , no. 2 , pp. 2266–2283 . https://doi.org/10.1093/mnras/sty1936
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 15088893
dc.identifier.otherPURE UUID: 7d4f5dbc-b662-4a36-80d5-eda2aadf5d7e
dc.identifier.otherArXiv: http://arxiv.org/abs/1807.08761v1
dc.identifier.otherScopus: 85055190984
dc.identifier.urihttp://hdl.handle.net/2299/20476
dc.descriptionAccepted for publication in MNRAS
dc.description.abstractUnderstanding 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*/M ⊙ > 10 10) 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 event 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.en
dc.format.extent18
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectGalaxies: evolution
dc.subjectGalaxies: formation
dc.subjectGalaxies: highredshift
dc.subjectGalaxies: interactions
dc.subjectMethods: numerical
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleThe role of mergers in driving morphological transformation over cosmic timeen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionCentre of Data Innovation Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85055190984&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2018-10-01
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/sty1936
rioxxterms.licenseref.uriOther
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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