TY - JOUR
T1 - The SAMI Galaxy Survey
T2 - Global stellar populations on the size-mass plane
AU - Scott, Nicholas
AU - Brough, S.
AU - Croom, Scott M.
AU - Davies, Roger L.
AU - van de Sande, Jesse
AU - Allen, J. T.
AU - Bland-Hawthorn, Joss
AU - Bryant, Julia J.
AU - Cortese, Luca
AU - D'Eugenio, Francesco
AU - Federrath, Christoph
AU - Ferreras, Ignacio
AU - Goodwin, Michael
AU - Groves, Brent
AU - Konstantopoulos, Iraklis
AU - Lawrence, Jon S.
AU - Medling, Anne M.
AU - Moffett, Amanda J.
AU - Owers, Matt S.
AU - Richards, Samuel
AU - Robotham, A. S.G.
AU - Tonini, Chiara
AU - Yi, Sukyoung K.
N1 - Publisher Copyright:
© 2018 The Author(s).
PY - 2017
Y1 - 2017
N2 - 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 bulgeto- 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.
AB - 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 bulgeto- 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.
KW - CD
KW - Galaxies: elliptical and lenticular
KW - Galaxies: evolution
KW - Galaxies: formation
KW - Galaxies: spiral
KW - Galaxies: stellar content
UR - http://www.scopus.com/inward/record.url?scp=85043580308&partnerID=8YFLogxK
U2 - 10.1093/MNRAS/STX2166
DO - 10.1093/MNRAS/STX2166
M3 - Article
SN - 0035-8711
VL - 472
SP - 2833
EP - 2855
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -