Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chandra X-Ray Spectral Analysis of Cooling Flow Clusters, 2A 0335+096
  and Abell 2199   We report on a spatially resolved analysis of Chandra X-ray data on a nearby
typical cooling flow cluster of galaxies 2A 0335+096, together with A 2199 for
a comparison. As recently found in the cores of other clusters, the temperature
around the central part of 2A 0335+096 is 1.3--1.5 keV, which is higher than
that inferred from the cooling flow picture. Furthermore, the absorption column
density is almost constant against the radius in 2A 0335+096; there is no
evidence of excess absorption up to 200--250 kpc. This indicates that no
significant amount of cold material, which has cooled down, is present. These
properties are similar to those of A 2199. Since the cooling time in the
central part is much shorter than the age of the clusters, a heating mechanism,
which weakens the effect of radiative cooling, is expected to be present in the
central part of both clusters of galaxies. Both 2A 0335+096 and A 2199 have
radio jets associated with their cD galaxy. We discuss the possibility of
heating processes caused by these radio jets by considering the thermal
conduction and the sound velocity together with the observed disturbance of the
ICM temperature and density. We conclude that the observed radio jets can
produce local heating and/or cooling, but do not sufficiently reduce the
overall radiative cooling. This implies that much more violent jets, whose
emission has now decayed, heated up the cooling gas $>10^9$ years ago.

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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio