Towards a New Classification of Early-type Galaxies: An Integral-field View

Falcon-Barroso, J., Bacon, R., Cappellari, M., Davies, R.L., de Zeeuw, P.T., Emsellem, E., Krajnovic, D., Kuntschner, H., McDermid, R.M., Peletier, R.F., Sarzi, M. and van de Ven, G. (2008) Towards a New Classification of Early-type Galaxies: An Integral-field View. In: In: Pathways Through an Eclectic Universe - ASP Conf Series 390 :. Astronomical Society of the Pacific, pp. 227-231. ISBN 978-1-58381-651-6
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In this proceedings paper we make use of the two-dimensional stel- lar kinematics of a representative sample of E and S0 galaxies obtained with the SAURON integral-field spectrograph to reveal that early-type galaxies appear in two broad flavors, depending on whether they exhibit clear large-scale rotation or not. We measure the level of rotation via a new parameter (λR) and use it as a basis for a new kinematic classification that separates early-type galaxies into slow and fast rotators. With the aid of broad-band imaging we will reinforce this finding by comparing our kinematic results to the photometric properties of these two classes.


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