Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematic Properties and Stellar Populations of Faint Early-Type
  Galaxies. I. Velocity Dispersion Measurements of Central Coma Galaxies   We present velocity dispersion measurements for 69 faint early-type galaxies
in the core of the Coma cluster, spanning -22.0<M_R<-17.5 mag. We examine the
L-\sigma relation for our sample and compare it to that of bright ellipticals
from the literature. The distribution of the the faint early-type galaxies in
the L-sigma plane follows the relation L ~ \sigma^{2.01\pm0.36}, which is
significantly shallower from L ~ \sigma^4 as defined for the bright
ellipticals. While increased rotational support for fainter early-type galaxies
could account for some of the difference in slope, we show that it cannot
explain it. We also investigate the Colour-\sigma relation for our Coma
galaxies. Using the scatter in this relation, we constrain the range of galaxy
ages as a function of their formation epoch for different formation scenarios.
Assuming a strong coordination in the formation epoch of faint early-type
systems in Coma, we find that most had to be formed at least 6 Gyrs ago and
over a short 1 Gyr period.

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The categories of this paper are: acc-phys
2
The categories of this paper are: math
1
The categories of this paper are: cs
16
The categories of this paper are: stat
3
The categories of this paper are: physics
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an