Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The stellar populations of E and S0 galaxies as seen with SAURON   We present selected results from integral-field spectroscopy of 48 early-type
galaxies observed as part of the SAURON survey. Maps of the Hbeta, Fe5015, Mgb
and Fe5270 indices in the Lick/IDS system were derived for each of the survey
galaxies. The metal line strength maps show generally negative gradients with
increasing radius roughly consistent with the morphology of the light profiles.
Remarkable deviations from this general trend exist, particularly the Mgb
isoindex contours appear to be flatter than the isophotes of the surface
brightness for about 40% of our galaxies without significant dust features.
Generally these galaxies exhibit significant rotation. We infer from this that
the fast-rotating component features a higher metallicity and/or an increased
Mg/Fe ratio as compared to the galaxy as a whole. We also use the line
strengths maps to compute average values integrated over circular apertures of
one effective radius, and derive luminosity weighted ages and metallicities.
The lenticular galaxies show a wide range in age and metallicity estimates,
while elliptical galaxies tend to occupy regions of older stellar populations.

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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: hep-th