Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Velocity Dispersion Function for Quiescent Galaxies in Nine
  Strong-Lensing Clusters   We measure the central stellar velocity dispersion function for quiescent
galaxies in a set of nine northern clusters in the redshift range $0.18 < z <
0.29$ and with strong lensing arcs in Hubble Space Telescope images. The
velocity dispersion function links galaxies directly to their dark matter
halos. From dense SDSS and MMT/Hectospec spectroscopy we identify $231 - 479$
spectroscopic members in each cluster. We derive physical properties of cluster
members including redshift, $D_{n}4000$, and central stellar velocity
dispersion and we include a table of these measurements for 3419 cluster
members. We construct the velocity dispersion functions for quiescent galaxies
with $D_{n}4000 > 1.5$ and within $R_{200}$. The cluster velocity dispersion
functions all show excesses at $\sigma \gtrsim 250 km s^{-1}$ compared to the
field velocity dispersion function. The velocity dispersion function slope at
large velocity dispersion ($\sigma > 160 km s^{-1}$) is steeper for more
massive clusters, consistent with the trend observed for cluster luminosity
functions. The spatial distribution of galaxies with large velocity dispersion
at radii larger than $R_{200}$ further underscores the probable major role of
dry mergers in the growth of massive cluster galaxies during cluster assembly.

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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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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: atom-ph
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The categories of this paper are: cond-mat