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dc.contributor.authorPhillipps, S
dc.contributor.authorAli, S S
dc.contributor.authorBremer, M N
dc.contributor.authorDe Propris, R
dc.contributor.authorSansom, A E
dc.contributor.authorCluver, M E
dc.contributor.authorAlpaslan, M
dc.contributor.authorBrough, S
dc.contributor.authorBrown, M J I
dc.contributor.authorDavies, L J M
dc.contributor.authorDriver, S P
dc.contributor.authorGrootes, M W
dc.contributor.authorHolwerda, B W
dc.contributor.authorHopkins, A M
dc.contributor.authorJames, P A
dc.contributor.authorPimbblet, K
dc.contributor.authorRobotham, A S G
dc.contributor.authorTaylor, E N
dc.contributor.authorWang, L
dc.date.accessioned2020-01-14T13:30:02Z
dc.date.available2020-01-14T13:30:02Z
dc.date.issued2019-12-19
dc.identifier265381858
dc.identifier7fc8ecb6-d3f3-43f1-a498-d96cac8d9451
dc.identifier85082659699
dc.identifier000512297600042
dc.identifier.citationPhillipps , S , Ali , S S , Bremer , M N , De Propris , R , Sansom , A E , Cluver , M E , Alpaslan , M , Brough , S , Brown , M J I , Davies , L J M , Driver , S P , Grootes , M W , Holwerda , B W , Hopkins , A M , James , P A , Pimbblet , K , Robotham , A S G , Taylor , E N & Wang , L 2019 , ' Galaxy And Mass Assembly (GAMA) : defining passive galaxy samples and searching for the UV upturn ' , Monthly Notices of the Royal Astronomical Society , vol. In press , stz3552 . https://doi.org/10.1093/mnras/stz3552en
dc.identifier.issn0035-8711
dc.identifier.othercrossref: 10.1093/mnras/stz3552
dc.identifier.urihttps://hdl.handle.net/10023/19274
dc.description.abstractWe use data from the GAMA and GALEX surveys to demonstrate that the UV upturn, an unexpected excess of ultraviolet flux from a hot stellar component, seen in the spectra of many early-type galaxies, arises from processes internal to individual galaxies with no measurable influence from the galaxies’ larger environment. We first define a clean sample of passive galaxies without a significant contribution to their UV flux from low-level star formation. We confirm that galaxies with the optical colours of red sequence galaxies often have signs of residual star formation, which, without other information, would prevent a convincing demonstration of the presence of UV upturns. However, by including (NUV−u) and WISE (W2-W3) colours, and FUV data where it exists, we can convincingly constrain samples to be composed of non-star-forming objects. Using such a sample, we examine GALEX photometry of low redshift GAMA galaxies in a range of low-density environments, from groups to the general field, searching for UV upturns. We find a wide range of (NUV−r) colours, entirely consistent with the range seen – and attributed to the UV upturn – in low-redshift red sequence cluster galaxies. The range of colours is independent of group multiplicity or velocity dispersion, with isolated passive galaxies just as likely to have blue UV-to-optical colours, implying significant upturn components, as those in richer groups and in the previous data on clusters. This is supported by equivalent results for (FUV−r) colours which are clear indicators of upturn components.
dc.format.extent517210
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectGalaxies: evolutionen
dc.subjectGalaxies: stellar contenten
dc.subjectGalaxies: star formationen
dc.subjectQB Astronomyen
dc.subject3rd-DASen
dc.subject.lccQBen
dc.titleGalaxy And Mass Assembly (GAMA) : defining passive galaxy samples and searching for the UV upturnen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doi10.1093/mnras/stz3552
dc.description.statusPeer revieweden


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