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Stellar Populations in KDCs of Sa Galaxies

Published online by Cambridge University Press:  01 December 2006

Jesús Falcón-Barroso ,
Roland Bacon ,
Michele Cappellari ,
Roger Davies ,
P. Tim de Zeeuw ,
Eric Emsellem ,
Davor Krajnović ,
Harald Kuntschner ,
Richard M. McDermid  and
Reynier F. Peletier
...Show all authors
Jesús Falcón-Barroso
Affiliation:
European Space and Technology Centre, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands email: jfalcon@rssd.esa.int Sterrewacht Leiden, University of Leiden, NL-2333 CA Leiden, The Netherlands
Roland Bacon
Affiliation:
Observatoire de Lyon, 9 av. Charles André, F-69230 Saint-Genis Laval, France
Michele Cappellari
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
Roger Davies
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
P. Tim de Zeeuw
Affiliation:
Sterrewacht Leiden, University of Leiden, NL-2333 CA Leiden, The Netherlands
Eric Emsellem
Affiliation:
Observatoire de Lyon, 9 av. Charles André, F-69230 Saint-Genis Laval, France
Davor Krajnović
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
Harald Kuntschner
Affiliation:
ST-ECF, European Southern Observatory, D-85748 Garching bei München, Germany
Richard M. McDermid
Affiliation:
Sterrewacht Leiden, University of Leiden, NL-2333 CA Leiden, The Netherlands
Reynier F. Peletier
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, NL-9700 AV Groningen, The Netherlands
Marc Sarzi
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, Hatfield, UK
Glenn van de Ven
Affiliation:
Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
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Abstract

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We present integral-field observations of kinematically decoupled components (KDCs) in a sample of 24 Sa galaxies part of the SAURON Survey. We show how the V/σ maps can be used to highlight the presence of the KDC and investigate their stellar populations (i.e. age) to understand their origin (i.e. secular vs hierarchical scenarios). We find that KDCs can be long-lived and are typically well aligned with the galaxies kinematical major axis, supporting mounting evidence that secular evolution becomes important at intermediate redshifts. Dynamically colder ones seem to host younger stellar populations. We also relate these features to the ones found in our sample of 48 elliptical and lenticular galaxies. We find that there is no age vs size relation for these decoupled components in Sa galaxies, suggesting that the dominant factor determining their size is the amount of star formation they have been subject to during their life time.

Keywords

galaxies: bulgesgalaxies: spiralgalaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 470 - 474
Copyright
Copyright © International Astronomical Union 2007

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