Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial density and temperature profiles of the intracluster gas
  constructed jointly from the X-ray surface brightness measurement and the
  universal density profile   In this paper we have made an attempt to derive the radial profiles of
density and temperature of intracluster gas based on the two well-established
facts at present: the X-ray observed surface brightness of clusters described
by the standard beta model and the (NFW) universal density profile as the
underlying dark matter distribution. We have numerically solved the hydrostatic
equation by demanding that the volumed-averaged baryon fraction of a cluster
should asymptotically approach the universal value at its viral radius. We have
shown that the radial temperature variation derived from these constraints
differs significantly from the conventional polytropic equation of state: The
gas temperature profile may show a dramatic increase or decrease with outward
radius, depending sensitively on the beta parameter. A large beta value
(typically greater than 0.8) is required in order to ensure that the X-ray
temperature makes a drop at the virial radius. This indicates that either the
NFW profile is inappropriate to apply for the overall dark matter distribution
of clusters or other non-gravitational heating processes may play an important
role in the dynamical evolution of clusters.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom