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| Paper: |
Secular Evolution in Action: Central Values and Radial Trends in Boxy Bulges |
| Volume: |
480, Structure and Dynamics of Disk Galaxies |
| Page: |
153 |
| Authors: |
Williams, M. J.; Bureau, M.; Kuntschner, H. |
| Abstract: |
We determine central values and radial trends in the
stellar populations of the bulges of a sample of 28 edge-on S0-Sb
disk galaxies, 22 of which are boxy/peanut-shaped (and therefore
barred). Our principal findings are the following. (1) At a given
velocity dispersion, the central stellar populations of galaxies
with boxy/peanut-shaped bulges are indistinguishable from those of
early-type (elliptical and S0) galaxies. Either secular evolution
affects stellar populations no differently to monolithic collapse or
mergers, or secular evolution is not important in the central
regions of these galaxies, despite the fact that they are barred.
(2) The radial metallicity gradients of boxy/peanut-shaped bulges
are uncorrelated with velocity dispersion and are, on average,
shallower than those of unbarred early-type galaxies. This is
qualitatively consistent with chemodynamical models of bar
formation, in which radial inflow and outflow smears out
pre-existing gradients. |
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