Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Effects of Substructure on Galaxy Cluster Mass Determinations   Although numerous studies of individual galaxy clusters have demonstrated the
presence of significant substructure, previous studies of the distribution of
masses of galaxy clusters determined from optical observations have failed to
explicitly correct for substructure in those systems. In this {\it Letter} I
present the distributions of velocity dispersion, mean separation, and
dynamical masses of clusters when substructure is eliminated from the cluster
datasets. I also discuss the changes in these distributions because of the
substructure correction. Comparing the masses of clusters with central galaxies
before and after correction for the presence of substructure reveals a
significant change. This change is driven by reductions in the mean separation
of galaxies, not by a decrease in the velocity dispersions as has generally
been assumed. Correction for substructure reduces most significantly the masses
of systems with cool X-ray temperatures, suggesting that the use of a constant
linear radius (1.5$h _{100} ^{-1}$ Mpc in this study) to determine cluster
membership is inappropriate for clusters spanning a range of temperatures
and/or morphologies.

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The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
1
The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ