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dc.contributor.authorScott, N.
dc.contributor.authorCappellari, M.
dc.contributor.authorDavies, R.L.
dc.contributor.authorBacon, R.
dc.contributor.authorde Zeeuw, P.T.
dc.contributor.authorEmsellem, E.
dc.contributor.authorFalcon-Barroso, J.
dc.contributor.authorKrajnovic, D.
dc.contributor.authorKuntschner, H.
dc.contributor.authorMcDermid, R.M.
dc.contributor.authorPeletier, R.F.
dc.contributor.authorPipino, A.
dc.contributor.authorSarzi, M.
dc.contributor.authorvan den Bosch, R.C.E.
dc.contributor.authorvan de Ven, G.
dc.contributor.authorvan Scherpenzeel, E.
dc.date.accessioned2010-02-26T14:27:11Z
dc.date.available2010-02-26T14:27:11Z
dc.date.issued2009
dc.identifier.citationScott , N , Cappellari , M , Davies , R L , Bacon , R , de Zeeuw , P T , Emsellem , E , Falcon-Barroso , J , Krajnovic , D , Kuntschner , H , McDermid , R M , Peletier , R F , Pipino , A , Sarzi , M , van den Bosch , R C E , van de Ven , G & van Scherpenzeel , E 2009 , ' The SAURON Project – XIV. No escape from Vesc: a global and local parameter in early-type galaxy evolution ' , Monthly Notices of the Royal Astronomical Society , vol. 398 , no. 4 , pp. 1835-1857 . https://doi.org/10.1111/j.1365-2966.2009.15275.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 155262
dc.identifier.otherPURE UUID: 11d637ff-5e36-458a-9c5a-e186b9c1bcfb
dc.identifier.otherdspace: 2299/4321
dc.identifier.otherScopus: 70349199443
dc.identifier.urihttp://hdl.handle.net/2299/4321
dc.description‘The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2009.15275.x
dc.description.abstractWe present the results of an investigation of the local escape velocity (Vesc) - line strength index relationship for 48 early type galaxies from the SAURON sample, the first such study based on a large sample of galaxies with both detailed integral field observations and extensive dynamical modelling. Values of Vesc are computed using Multi Gaussian Expansion (MGE) photometric fitting and axisymmetric, anisotropic Jeans' dynamical modelling simultaneously on HST and ground-based images. We determine line strengths and escape velocities at multiple radii within each galaxy, allowing an investigation of the correlation within individual galaxies as well as amongst galaxies. We find a tight correlation between Vesc and the line-strength indices. For Mgb we find that this correlation exists not only between different galaxies but also inside individual galaxies - it is both a local and global correlation. The relation within individual galaxies has the same slope and offset as the global relation to a good level of agreement, though there is significant intrinsic scatter in the local gradients. We transform our line strength index measurements to the single stellar population (SSP) equivalent age (t), metallicity ([Z/H]) and enhancement ([$\alpha$/Fe]) and carry out a principal component analysis of our SSP and Vesc data. We find that in this four-dimensional parameter space the galaxies in our sample are to a good approximation confined to a plane, given by $\log \mathrm({V}_{\mathrm{esc}}/500\mathrm{km/s}) = 0.85 \mathrm{[Z/H]} + 0.43 \log (\mathrm{t}/\mathrm{Gyrs})$ - 0.20. It is surprising that it is a combination of age and metallicity that is conserved; this may indicate a 'conspiracy' between age and metallicity or a weakness in the SSP models.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.titleThe SAURON Project – XIV. No escape from Vesc: a global and local parameter in early-type galaxy evolutionen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2009
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2009.15275.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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