Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of cooling and star formation on the baryon fractions in
  clusters   We study the effects of dissipation on the baryon fractions in clusters using
high-resolution cosmological simulations of nine clusters that resolve
formation of cluster galaxies. The simulations of each cluster are performed
with the shock-capturing eulerian adaptive mesh refinement N-body+gasdynamics
ART code with and without radiative cooling. We show that dissipation and
associated galaxy formation increase the total baryon fractions within radii as
large as the virial radius. The effect is the strongest within cluster cores,
where the simulations with cooling have baryon fractions larger than the
universal value, while the fraction of baryons in adiabatic simulations are
smaller than universal. At larger radii (r >~ r_500) the cumulative baryon
fractions in simulations with cooling are close to, while those in the
adiabatic runs remain below than, the universal value. The gas fractions in
simulations with dissipation are reduced by ~20-40% at r<0.3r_vir and ~10% at
larger radii compared to the adiabatic runs, because a fraction of gas is
converted into stars. There is an indication that gas fractions within
different radii increase with increasing cluster mass as f_gas ~ M_vir^0.2. We
find that the total baryon fraction within the virial radius does not evolve
with time in both adiabatic simulations and in simulations with cooling.
Finally, to evaluate systematic uncertainties in the baryon fraction in
cosmological simulations we present a comparison of gas fractions in our
adiabatic simulations to re-simulations of the same objects with the
entropy-conserving SPH code Gadget. The cumulative gas fraction profiles in the
two sets of simulations on average agree to <~3% at r/r_vir>0.2, but differ
systematically by up to 10% at small radii.

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The categories of this paper are: quant-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con