Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of galaxy halos in Clusters and Voids   We use the results of a high resolution N-body simulation to investigate the
role of the environment on the formation and evolution of galaxy-sized halos.
Starting from a set of constrained initial conditions, we have produced a final
configuration hosting a double cluster in one octant and a large void extending
over two octants of the simulation box. We present results for two statistics:
the relationship between 1-D velocity dispersion and mass and the probability
distribution of the spin parameter $P(\lambda)$. The \svm relationship is well
reproduced by the Truncated Isothermal Sphere (TIS) model introduced by Shapiro
et al. (1999), although the slope is different from the original prediction. A
series of \svm relationships for different values of the anisotropy parameter
$\beta$, obtained using the theoretical predictions by Lokas and Mamon (2001)
for NFW density profiles are found to be only marginally consistent with the
data. Using some properties of the equilibrium TIS models, we construct
subsamples of {\em fiducial} equilibrium TIS halos from each of the three
subregions, and we study their properties. For these halos, we do find an
environmental dependence of their properties, in particular of the spin
parameter distribution $P(\lambda)$. We study in more detail the TIS model, and
we find new relationships between the truncation radius and other structural
parameters. No gravitationally bound halo is found having a radius larger than
the critical value for gravithermal instability for TIS halos (\rt $\ge 34.2
r_{0}$, where $r_{0}$ is the core radius of the TIS solution). We do however
find a dependence of this relationship on the environment, like for the
$P(\lambda)$ statistics. These facts hint at a possible r\^{o}le of tidal
fields at determining the statistical properties of halos.

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The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: econ
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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: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph