Scott, N;
Brough, S;
Croom, SM;
Davies, RL;
van de Sande, J;
Allen, JT;
Bland-Hawthorn, J;
... Yi, SK; + view all
(2017)
The SAMI Galaxy Survey: global stellar populations on the size-mass plane.
Monthly Notices of the Royal Astronomical Society
, 472
(3)
pp. 2833-2855.
10.1093/mnras/stx2166.
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Abstract
We present an analysis of the global stellar populations of galaxies in the SAMI (Sydney-AAO Multi-object Integral field spectrograph) Galaxy Survey. Our sample consists of 1319 galaxies spanning four orders of magnitude in stellar mass and includes all morphologies and environments. We derive luminosity-weighted, single stellar population equivalent stellar ages, metallicities and alpha enhancements from spectra integrated within one effective radius apertures. Variations in galaxy size explain the majority of the scatter in the age–mass and metallicity–mass relations. Stellar populations vary systematically in the plane of galaxy size and stellar mass, such that galaxies with high stellar surface mass density are older, more metal rich and alpha enhanced than less dense galaxies. Galaxies with high surface mass densities have a very narrow range of metallicities; however, at fixed mass, the spread in metallicity increases substantially with increasing galaxy size (decreasing density). We identify residual correlations with morphology and environment. At fixed mass and size, galaxies with late-type morphologies, small bulges and low Sérsic n are younger than early type, high n, high bulge-to-total galaxies. Both age and metallicity show small residual correlations with environment; at fixed mass and size, galaxies in denser environments or more massive haloes are older and somewhat more metal rich than those in less dense environments. We connect these trends to evolutionary tracks within the size–mass plane.
| Type: | Article |
|---|---|
| Title: | The SAMI Galaxy Survey: global stellar populations on the size-mass plane |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx2166 |
| Publisher version: | http://doi.org/10.1093/mnras/stx2166 |
| Language: | English |
| Additional information: | © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation galaxies: spiral, galaxies: stellar content., LINE-STRENGTH MAPS, STAR-FORMATION HISTORIES, TO-LIGHT RATIO, SAURON PROJECT, ATLAS(3D) PROJECT, ASSEMBLY GAMA, ENVIRONMENTAL DEPENDENCE, LENTICULAR GALAXIES, ELLIPTIC GALAXIES, GLOBULAR-CLUSTERS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1572434 |
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