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The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps

  • Reynier F. Peletier (a1), Jesús Falcón-Barroso (a2), Katia Ganda (a1), Roland Bacon (a3), Michele Cappellari (a4), Roger L. Davies (a4), P. Tim de Zeeuw (a5), Eric Emsellem (a3), Davor Krajnović (a4), Harald Kuntschner (a6), Richard M. McDermid (a5), Marc Sarzi (a7) and Glenn van de Ven (a8)...

Abstract

We discuss SAURON absorption line strength maps of a sample of 24 early-type spirals, mostly Sa. From the Lick indices Hβ, Mgb and Fe 5015 we derive SSP-ages and metallicities. By comparing the scaling relations of Mg b and Hβ and central velocity dispersion with the same relation for the edge-on sample of Falcón-Barroso et al. (2002) we derive a picture in which the central regions of Sa galaxies contain at least 2 components: one (or more) thin, disc-like component, often containing recent star formation, and another, elliptical-like component, consisting of old stars and rotating more slowly, dominating the light above the plane. If one defines a bulge to be the component responsible for the light in excess of the outer exponential disc, then many Sa-bulges are dominated by a thin, disc-like component containing recent star formation.

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The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps

  • Reynier F. Peletier (a1), Jesús Falcón-Barroso (a2), Katia Ganda (a1), Roland Bacon (a3), Michele Cappellari (a4), Roger L. Davies (a4), P. Tim de Zeeuw (a5), Eric Emsellem (a3), Davor Krajnović (a4), Harald Kuntschner (a6), Richard M. McDermid (a5), Marc Sarzi (a7) and Glenn van de Ven (a8)...

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