Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intracluster gas pressure, entropy injection and redshift evolution   We study the effect of entropy injection in the intracluster medium (ICM) in
light of the recent observationally determined universal pressure profile of
the ICM. Beginning with a power-law entropy profile that is expected in the
absence of any feedback, we show that a simple universal prescription of
entropy injection results in the final, observed universal pressure profile.
This simple prescription has two components, one associated with an overall
increase in entropy and another associated with injection in the central parts
of the cluster. Importantly, both the components of entropy injection are
needed to produce the final universal pressure profile. This is indicative of a
need of both preheating the ICM as well {\it in situ} AGN/SNe heating. We
demonstrate the usefulness of the method by extending the calculations to
clusters at high redshift, and predict redshift evolution of cluster scaling
relations that can be tested against data. We show that the self-similar
evolution of the universal pressure profile is equivalent to a negative
evolution of entropy injection with redshift, with a scaling $S_{inj} \propto
(1+z)^{-0.8} S_{inj}(z=0)$. We also show the current observational data are
indicative of the entropy injection decreasing with redshift.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn