Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The structural and scaling properties of nearby galaxy clusters - II.
  The M-T relation   Using a sample of ten nearby (z< 0.15), relaxed galaxy clusters in the
temperature range [2-9] keV, we have investigated the scaling relation between
the mass at various density contrasts (delta=2500,1000,500,200) and the cluster
temperature. The masses are derived from NFW-type model fits to mass profiles,
obtained under the hydrostatic assumption using precise measurements, with XMM,
at least down to delta=1000. The logarithmic slope of the M-T relation is well
constrained and is the same at all delta, reflecting the self-similarity of the
mass profiles. At delta=500, the slope of the relation for the sub-sample of
hot clusters (kT>3.5 keV) is consistent with the standard self-similar
expectation: alpha= 1.49\pm0.15. The relation steepens when the whole sample is
considered: alpha=1.71\pm0.09. The normalisation of the relation is discrepant
(by ~ 30%), at all density contrasts, with the prediction from purely
gravitation based models. Models that take into account radiative cooling and
galaxy feedback are generally in better agreement with our data. We argue that
remaining discrepancies, in particular at low delta, are more likely due to
problems with models of the ICM thermal structure rather than to an incorrect
estimate of the mass from X-ray data.

17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn