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dc.contributor.authorMartin, G.
dc.contributor.authorJackson, R. A.
dc.contributor.authorKaviraj, S.
dc.contributor.authorChoi, H.
dc.contributor.authorDevriendt, J. E. G.
dc.contributor.authorDubois, Y.
dc.contributor.authorKimm, T.
dc.contributor.authorKraljic, K.
dc.contributor.authorPeirani, S.
dc.contributor.authorPichon, C.
dc.contributor.authorVolonteri, M.
dc.contributor.authorYi, S. K.
dc.date.accessioned2021-01-20T14:30:25Z
dc.date.available2021-01-20T14:30:25Z
dc.date.issued2020-11-07
dc.identifier.citationMartin , G , Jackson , R A , Kaviraj , S , Choi , H , Devriendt , J E G , Dubois , Y , Kimm , T , Kraljic , K , Peirani , S , Pichon , C , Volonteri , M & Yi , S K 2020 , ' The role of mergers and interactions in driving the evolution of dwarf galaxies over cosmic time ' , Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/staa3443
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 24366331
dc.identifier.otherPURE UUID: 66497398-f58f-4a2c-a5db-488d655287f8
dc.identifier.otherArXiv: http://arxiv.org/abs/2007.07913v2
dc.identifier.otherORCID: /0000-0002-5601-575X/work/87354043
dc.identifier.otherScopus: 85098863825
dc.identifier.urihttp://hdl.handle.net/2299/23707
dc.descriptionThis is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record is available online at: https://doi.org/10.1093/mnras/staa3443
dc.description.abstractDwarf galaxies (M⋆ < 109 M☉) are key drivers of mass assembly in high-mass galaxies, but relatively little is understood about the assembly of dwarf galaxies themselves. Using the NEWHORIZON cosmological simulation (∼40 pc spatial resolution), we investigate how mergers and fly-bys drive the mass assembly and structural evolution of around 1000 field and group dwarfs up to z = 0.5. We find that, while dwarf galaxies often exhibit disturbed morphologies (5 and 20 per cent are disturbed at z = 1 and z = 3 respectively), only a small proportion of the morphological disturbances seen in dwarf galaxies are driven by mergers at any redshift (for 109 M☉, mergers drive under 20 per cent morphological disturbances). They are instead primarily the result of interactions that do not end in a merger (e.g. fly-bys). Given the large fraction of apparently morphologically disturbed dwarf galaxies which are not, in fact, merging, this finding is particularly important to future studies identifying dwarf mergers and post-mergers morphologically at intermediate and high redshifts. Dwarfs typically undergo one major and one minor merger between z = 5 and z = 0.5, accounting for 10 per cent of their total stellar mass. Mergers can also drive moderate star formation enhancements at lower redshifts (3 or 4 times at z = 1), but this accounts for only a few per cent of stellar mass in the dwarf regime given their infrequency. Non-merger interactions drive significantly smaller star formation enhancements (around two times), but their preponderance relative to mergers means they account for around 10 per cent of stellar mass formed in the dwarf regime.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectastro-ph.GA
dc.titleThe role of mergers and interactions in driving the evolution of dwarf galaxies 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
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/staa3443
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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