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Towards a new classification of early-type galaxies: an integral-field view

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arxiv 0709.0357 v1 pith:U5YFOJKF submitted 2007-09-04 astro-ph

Towards a new classification of early-type galaxies: an integral-field view

classification astro-ph
keywords galaxiesearly-typeclassificationintegral-fieldkinematicrotationappearbasis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this proceeding we make use of the two-dimensional stellar 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 flavours, depending on whether they exhibit clear large-scale rotation or not. We measure the level of rotation via a new parameter LambdaR 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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