Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The X-ray Scaling Properties of Virialized Systems   Virialized systems, such as clusters and groups of galaxies, represent an
ideal laboratory for investigating the formation and evolution of structure on
the largest scales. Furthermore, the properties of the gaseous intracluster
medium provide key insights into the influence of important non-gravitational
processes like energy injection and radiative cooling, resulting from feedback
associated with star formation, for example. We have assembled a very large
X-ray sample of virialized systems, spanning over two decades in halo mass.
Each object has high-quality X-ray data available, enabling a full deprojection
analysis to be made; for a subsample we have additionally determined the
deprojected optical light distribution. We find clear evidence of a departure
from the simple expectations of self-similarity. The intracluster medium is
more spatially extended and systematically less dense in smaller haloes, and
there is evidence of an entropy excess in the hot gas. Our results favour a
significant role for both non-gravitational heating and radiative cooling in
modifying the properties of this gas, although we find no clear evidence of
significantly enhanced star formation efficiency in groups.

33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex