Stellar populations of early-type galaxies in the ATLAS3D sample

Serra, P.; McDermid, R. M.; Alatalo, K.; Blitz, L.; Bois, M.; Bournaud, F.; Bureau, M.; Cappellari, M.; Davies, R. L.; Davis, T. A.; de Zeeuw, P. T.; Emsellem, E.; Falcón-Barroso, J.; Khochfar, S.; Krajnović, D.; Kuntschner, H.; Lablanche, P.-Y.; Morganti, R.; Naab, T.; Sarzi, M.; Scott, N.; van den Bosch, R. C. E.; van de Ven, G.; Weijmans, A.; Young, L. M.
Referencia bibliográfica

PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conference Proceedings, Volume 1111, pp. 111-114 (2009).

Fecha de publicación:
5
2009
Número de autores
25
Número de autores del IAC
0
Número de citas
6
Número de citas referidas
5
Descripción
ATLAS3D is a multi-wavelength, volume-limited survey of 263 morphologically-selected early-type galaxies within a distance of 42 Mpc and complete to MK<=-21.5. Here we present the ATLAS3D project and our first results on the stellar populations of galaxies in the ATLAS3D sample based on SAURON integral-field spectroscopy. We show relations between integrated line-strength indices and stellar velocity dispersion σ in the range 55<=σ(km/s)<=350. We derive simple-stellar-population-equivalent age, metallicity and α/Fe abundance ratio and discuss their relation to stellar velocity dispersion, environment and galaxy internal kinematics. These preliminary results indicate that slow rotators tend to be older and have less variation in age than fast rotators. We also find that galaxies in lower density environments are on average younger than those in denser environments, as found by other authors.