Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stellar population gradients in early-type cluster galaxies with VIMOS
  IFU   We present results from a pilot study of radial stellar population trends in
early-type galaxies using the VLT VIMOS integral field unit (IFU). We observe
twelve galaxies in the cluster Abell 3389 (z~0.027). For each galaxy, we
measure 22 line-strength indices in multiple radial bins out to at least the
effective radius. We derive stellar population parameters using a grid
inversion technique, and calculate the radial gradients in age, metallcity and
alpha-abundance. Generally, the galaxies in our sample have flat radial trends
in age and [alpha/Fe], but negative gradients in [Z/H] (-0.20 +/- 0.05 dex).
Combining our targets with two similar, long-slit studies to increase sample
size, we find that the gradients are not correlated with the central velocity
dispersion or K-band luminosity (both proxies for galaxy mass). However, we
find that the age and metallicity gradients are both anti-correlated with their
respective central values (to > 4 sigma), such that galaxies with young cores
have steeper positive age gradients, and those with metal-rich centres have
strong negative [Z/H] gradients.

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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio