Show simple item record

dc.contributor.authorKaviraj, S.
dc.contributor.authorPeirani, S.
dc.contributor.authorKhochfar, S.
dc.contributor.authorSilk, J.
dc.contributor.authorKay, S.
dc.date.accessioned2013-10-30T16:30:54Z
dc.date.available2013-10-30T16:30:54Z
dc.date.issued2009-04-01
dc.identifier.citationKaviraj , S , Peirani , S , Khochfar , S , Silk , J & Kay , S 2009 , ' The role of minor mergers in the recent star formation history of early-type galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 394 , no. 4 , pp. 1713-1720 . https://doi.org/10.1111/j.1365-2966.2009.14403.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 2067296
dc.identifier.otherPURE UUID: 74b6d9c3-9b53-413f-a6cf-1296ddf66e36
dc.identifier.otherScopus: 67549120464
dc.identifier.otherORCID: /0000-0002-5601-575X/work/77850141
dc.identifier.urihttp://hdl.handle.net/2299/11937
dc.description.abstractWe demonstrate that the large scatter in the ultraviolet (UV) colours of intermediate-mass early-type galaxies in the local Universe and the inferred low-level recent star formation (RSF) in these objects can be reproduced by minor mergers in the standard Λ cold dark matter (ΛCDM)cosmology.Numerical simulations of mergerswith mass ratios≤1:4, with reasonable assumptions for the ages, metallicities and dust properties of the merger progenitors, produce good agreement with the observed UV colours of the early-type population, if the infalling satellites are assumed to have (cold) gas fractions ≥20 per cent. Early-types that satisfy (NUV - r) ≲ 3.8 are likely to have experienced mergers with mass ratios between 1:4 and 1:6 within the last ~1.5 Gyr, while those that satisfy 3.8 <(NUV - r) <5.5 are consistent with either recent mergers with mass ratios ≤1:6 or mergers with higher mass ratios that occurred more than ~1.5Gyr in the past.We demonstrate that the early-type colour-magnitude relations and colour distributions, in both the UV and optical spectral ranges, are consistent with the expected frequency of minor merging activity in the standard ΛCDM cosmology at low redshift. We present a strong plausibility argument for minor mergers to be the principal mechanism behind the large UV scatter and associated low-level RSF observed in early-type galaxies in the nearby Universe.en
dc.format.extent8
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleThe role of minor mergers in the recent star formation history of early-type galaxiesen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre of Data Innovation Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=67549120464&partnerID=8YFLogxK
rioxxterms.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2009.14403.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record