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25 April 2024 |
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The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps | | Reynier F. Peletier
; Jesus Falcon-Barroso
; Katia Ganda
; Roland Bacon
; Michele Cappellari
; Roger L. Davies
; P. Tim de Zeeuw
; Eric Emsellem
; Davor Krajnovic
; Harald Kuntschner
; Richard M. McDermid
; Marc Sarzi
; Glenn van de Ven
; | | Date: |
9 Feb 2007 | | Abstract: | We discuss SAURON absorption line strength maps of a sample of 24 early-type spirals, mostly Sa. From the Lick indices H$eta$, 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. | | Source: | arXiv, astro-ph/0702256 | | Services: | Forum | Review | PDF | Favorites | |
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