Fast and Slow Rotators: The build-up of the Red Sequence

Details Fast and Slow Rotators: The build-up of the Red Sequence Fast and Slow Rotators: The build-up of the Red Sequence

2007-09-25

arxiv.org/abs/0709.3964v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. To appear in the Proceedings of IAU Symposium 245 "Formation and Evolution of Galaxy Bulges", Eds M. Bureau

Scientific paper

10.1017/S1743921308017158

Using the unique dataset obtained within the course of the SAURON project, a radically new view of the structure, dynamics and stellar populations of early-type galaxies has emerged. We show that galaxies come in two broad flavours (slow and fast rotators), depending on whether or not they exhibit clear large-scale rotation, as indicated via a robust measure of the specific angular momentum of baryons. This property is also linked with other physical characteristics of early-type galaxies, such as: the presence of dynamically decoupled cores, orbital structure and anisotropy, stellar populations and dark matter content. I here report on the observed link between this baryonic angular momentum and a mass sequence, and how this uniquely relates to the building of the red sequence via dissipative/dissipationless mergers and secular evolution.

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