Star formation in nearby early-type galaxies

Mapping in UV, optical and CO

M. Bureau*, R. Bacon, M. Cappellari, F. Combes, R. L. Davies, P. T. De Zeeuw, E. Emsellem, J. Falcn-Barroso, H. Jeong, D. Krajnovi, H. Kuntschner, R. M. McDermid, R. F. Peletier, M. Sarzi, K. L. Shapiro, G. Van De Ven, S. K. Yi, L. M. Young

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

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).

Original languageEnglish
Pages (from-to)304
Number of pages1
JournalProceedings of the International Astronomical Union
Volume2
Issue numberS235
DOIs
Publication statusPublished - Aug 2006
Externally publishedYes

Keywords

  • CD
  • Galaxies: elliptical and lenticular
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: individual (NGC 2974, NGC 3032, NGC 4150, NGC 4459, NGC 4526)
  • Galaxies: kinematics and dynamics
  • Galaxies: stellar content

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