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Star Formation in Nearby Early-Type Galaxies: Mapping in UV, Optical and CO

Published online by Cambridge University Press:  01 August 2006

M. Bureau
Affiliation:
Sub-Department of Astrophysics, University of Oxford, United Kingdom
R. Bacon
Affiliation:
Centre de Recherche Astronomique de Lyon – Observatoire, France
M. Cappellari
Affiliation:
Sterrewacht Leiden, Universiteit Leiden, The Netherlands
F. Combes
Affiliation:
Observatoire de Paris, France
R. L. Davies
Affiliation:
Sub-Department of Astrophysics, University of Oxford, United Kingdom
P. T. de Zeeuw
Affiliation:
Sterrewacht Leiden, Universiteit Leiden, The Netherlands
E. Emsellem
Affiliation:
Centre de Recherche Astronomique de Lyon – Observatoire, France
J. Falcón-Barroso
Affiliation:
European Space Research and Technology Centre, The Netherlands
H. Jeong
Affiliation:
Department of Astronomy, Yonsei University, South Korea
D. Krajnović
Affiliation:
Sub-Department of Astrophysics, University of Oxford, United Kingdom
H. Kuntschner
Affiliation:
ST-ECF, European Southern Observatory, Germany
R. M. McDermid
Affiliation:
Sterrewacht Leiden, Universiteit Leiden, The Netherlands
R. F. Peletier
Affiliation:
Kapteyn Astronomical Institute, Universiteit Groningen, The Netherlands
M. Sarzi
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, United Kingdom
K. L. Shapiro
Affiliation:
Department of Astronomy, University of California Berkeley, U.S.A.
G. van de Ven
Affiliation:
Department of Astrophysical Sciences, Princeton University, U.S.A.
S. K. Yi
Affiliation:
Department of Astronomy, Yonsei University, South Korea
L. M. Young
Affiliation:
Department of Physics, New Mexico Institute of Mining and TechnologyU.S.A.
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Abstract

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The SAURON integral-field survey reveals that small (~0.1,Re) kinematically decoupled cores (KDCs) in early-type galaxies are increasingly young toward the center and are typically found in fast-rotating galaxies, while large KDCs (~0.5 Re) have homogeneously old stars and are present in non-rotating galaxies (McDermid et al. 2006). GALEX UV imaging further allows the direct identification of regions of recent star formation (≤0.5 Gyr). In NGC 2974 for example, young stars are identified in the center and an outer ring Jeong et al. 2006). Nuclear and inner ionised-gas rings (Sarzi et al. 2006) then suggest that current star formation is bar-driven. The CO detection rate of SAURON early-type galaxies is ≈40% (Combes et al. in prep.). Synthesis imaging reveals that it is generally contained in a well-ordered central disk, both in galaxies with a (young) central stellar disk (e.g. NGC 4459, NGC 4526) or a (young) KDC (e.g. NGC 3032, NGC 4150) (Young et al. in prep.). CO also traces well the young stellar populations and ionised gas distribution and kinematics, but in KDCs not always the stellar kinematics Emsellem et al. 2004; Sarzi et al. 2006; Kuntschner et al. 2006).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Emsellem, E. 2004, MNRAS 352, 721.CrossRefGoogle Scholar
Jeong, H., Bureau, M., Yi, S.K., Krajnović, D., & Davies, R.L. 2006, MNRAS submitted.Google Scholar
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McDermid, R.M. 2006, MNRAS submitted.Google Scholar
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