The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps

Details The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps

2007-02-09

arxiv.org/abs/astro-ph/0702256v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to be published in the proceedings of IAU Symposium No. 241, "Stellar Populations as Building Blocks of Ga

Scientific paper

10.1017/S1743921307008836

We discuss SAURON absorption line strength maps of a sample of 24 early-type spirals, mostly Sa. From the Lick indices H$\beta$, Mg b and Fe 5015 we derive SSP-ages and metallicities. By comparing the scaling relations of Mg b and H beta and central velocity dispersion with the same relation for the edge-on sample of Falcon-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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