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dc.contributor.authorPawlik, Milena
dc.contributor.authorWild, Vivienne
dc.contributor.authorWalcher, C. J.
dc.contributor.authorJohansson, P. H.
dc.contributor.authorVillforth, Carolin
dc.contributor.authorRowlands, Kate Elizabeth
dc.contributor.authorMendez Abreu, Jairo
dc.contributor.authorHewlett, Tim
dc.identifier.citationPawlik , M , Wild , V , Walcher , C J , Johansson , P H , Villforth , C , Rowlands , K E , Mendez Abreu , J & Hewlett , T 2016 , ' Shape asymmetry : a morphological indicator for automatic detection of galaxies in the post-coalescence merger stages ' , Monthly Notices of the Royal Astronomical Society , vol. 456 , no. 3 , pp. 3032-3052 .
dc.identifier.otherPURE: 239951693
dc.identifier.otherPURE UUID: af37d3e9-5ea7-4c0a-b85c-f6630856ea86
dc.identifier.otherBibCode: 2015arXiv151202000P
dc.identifier.otherBibCode: 2016MNRAS.456.3032P
dc.identifier.otherScopus: 84971597002
dc.identifier.otherWOS: 000372265200058
dc.descriptionMMP and VW acknowledge support from the European Career Reintegration Grant Phiz-Ev (P.I. VW). VW, KR and JM-A acknowledge support from the European Research Council Starting Grant SEDMorph (P.I. VW). CJW acknowledges support through the Marie Curie Career Integration Grant 303912. PHJ acknowledges the support of the Academy of Finland grant 1274931.en
dc.description.abstractWe present a new morphological indicator designed for automated recognition of galaxies with faint asymmetric tidal features suggestive of an ongoing or past merger. We use the new indicator, together with pre-existing diagnostics of galaxy structure to study the role of galaxy mergers in inducing (post-) starburst spectral signatures in local galaxies, and investigate whether (post-) starburst galaxies play a role in the build-up of the ‘red sequence’. Our morphological and structural analysis of an evolutionary sample of 335 (post-) starburst galaxies in the Sloan Digital Sky Survey DR7 with starburst ages 0 < tSB < 0.6 Gyr, shows that 45 per cent of galaxies with young starbursts (tSB < 0.1 Gyr) show signatures of an ongoing or past merger. This fraction declines with starburst age, and we find a good agreement between automated and visual classifications. The majority of the oldest (post-) starburst galaxies in our sample (tSB ∼ 0.6 Gyr) have structural properties characteristic of early-type discs and are not as highly concentrated as the fully quenched galaxies commonly found on the ‘red sequence’ in the present day Universe. This suggests that, if (post-) starburst galaxies are a transition phase between active star-formation and quiescence, they do not attain the structure of presently quenched galaxies within the first 0.6 Gyr after the starburst.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rights© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at:
dc.subjectGalaxies: evolutionen
dc.subjectGalaxies: interactionsen
dc.subjectGalaxies: starbursten
dc.subjectGalaxies: structureen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleShape asymmetry : a morphological indicator for automatic detection of galaxies in the post-coalescence merger stagesen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Research Councilen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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