Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-13
Astronomy and Astrophysics
Astrophysics
To be published in the proceedings of IAU Colloquium 198 on a "near-field cosmology with dwarf elliptical galaxies"
Scientific paper
10.1017/S1743921305003510
What is the origin of the numerous population of diffuse elliptical galaxies (dE) in clusters? These galaxies formed their stars several billion years ago and lost their gas. Though the stellar winds resulting from star formation and the interactions with the environment undoubedtly play a role, their respective role and details of the mechanism of this evolution is still debated. In this presentation we will review the first 3D spectroscopic observations of a handful of dE galaxies. These data reveal complex kinematical structures, with embedded discs and counter rotating cores, and they open extremely promising perspectives for studying the history of the stellar population throughout these various features. The presence of disks, which was already known from detailed image analysis, and of complex kinematics and the new constraints on the stellar population enforce the hypothesis of the evolutionary connection between dEs and disk galaxies.
Afanasiev Victor
Chilingarian Igor
Prugniel Philippe
Sil'chenko Olga
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