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dc.contributor.authorWeijmans, Anne-Marie
dc.contributor.authorde Zeeuw, P. T.
dc.contributor.authorEmsellem, Eric
dc.contributor.authorKrajnovic, Davor
dc.contributor.authorLablanche, Pierre-Yves
dc.contributor.authorAlatalo, Katherine
dc.contributor.authorBlitz, Leo
dc.contributor.authorBois, Maxime
dc.contributor.authorBournaud, Frederic
dc.contributor.authorBureau, Martin
dc.contributor.authorCappellari, Michele
dc.contributor.authorCrocker, Alison
dc.contributor.authorDavies, Roger
dc.contributor.authorDavis, Timothy
dc.contributor.authorDuc, Pierre-Alain
dc.contributor.authorKhochfar, Sadegh
dc.contributor.authorKuntschner, Harald
dc.contributor.authorMcDermid, Richard
dc.contributor.authorMorganti, Raffaella
dc.contributor.authorNaab, Thorsten
dc.contributor.authorOosterloo, Tom
dc.contributor.authorSarzi, Marc
dc.contributor.authorScott, Nicholas
dc.contributor.authorSerra, Paolo
dc.contributor.authorVerdoes Kleijn, Gijs
dc.contributor.authorYoung, Lisa
dc.identifier.citationWeijmans , A-M , de Zeeuw , P T , Emsellem , E , Krajnovic , D , Lablanche , P-Y , Alatalo , K , Blitz , L , Bois , M , Bournaud , F , Bureau , M , Cappellari , M , Crocker , A , Davies , R , Davis , T , Duc , P-A , Khochfar , S , Kuntschner , H , McDermid , R , Morganti , R , Naab , T , Oosterloo , T , Sarzi , M , Scott , N , Serra , P , Verdoes Kleijn , G & Young , L 2014 , ' The ATLAS 3D project - XXIV. The intrinsic shape distribution of early-type galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 444 , no. 4 , pp. 3340-3356 .
dc.identifier.otherBibCode: 2014arXiv1408.1099W
dc.identifier.otherORCID: /0000-0002-5908-6852/work/40233497
dc.description.abstractWe use the ATLAS3D sample to perform a study of the intrinsic shapes of early-type galaxies, taking advantage of the available combined photometric and kinematic data. Based on our ellipticity measurements from the Sloan Digital Sky Survey Data Release 7, and additional imaging from the Isaac Newton Telescope, we first invert the shape distribution of fast and slow rotators under the assumption of axisymmetry. Theso-obtained intrinsic shape distribution for the fast rotators can be described with a Gaussian with a mean flattening of q=0.25 and standard deviation σq = 0.14, and an additional tail towards rounder shapes.The slow rotators are much rounder, and are well described with a Gaussian with mean q = 0.63 and σq =0.09. We then checked that our results were consistent when applying a different and independent method to obtain intrinsic shape distributions, by fitting the observed ellipticity distributions directly using Gaussian parametrizations for the intrinsic axis ratios. Although both fast and slow rotators are identified as early-type galaxies in morphological studies, and in many previous shape studies are therefore grouped together, their shape distributions are significantly different, hinting at different formation scenarios. The intrinsic shape distribution of the fast rotators shows similarities with the spiral galaxy population. Including the observed kinematic misalignment in our intrinsic shape study shows that the fast rotators are predominantly axisymmetric, with only very little room for triaxiality. For the slow rotators though there are very strong indications that they are (mildly) triaxial.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectGalaxies: elliptical and lenticular, cDen
dc.subjectGalaxies: structureen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe ATLAS3D project - XXIV. The intrinsic shape distribution of early-type galaxiesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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