Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Chandra observation of the disturbed cluster core of Abell 2204   We present results from an observation of the luminous cluster of galaxies
Abell 2204 using the Chandra X-ray Observatory. We show the core of the cluster
has a complex morphological structure, made up of a high density core (n_e~0.2
cm^-3) with flat surface brightness, a surrounding central plateau, a tail-like
feature, wrapping around to the east, and an unusual radio source. A
temperature map and deprojected-profile shows that the temperature rises
steeply outside these regions, until around ~100 kpc where it drops, then rises
again. Abundance maps and profiles show that there is a corresponding increase
in abundance at the same radius as where the temperature drops. In addition
there are two cold fronts at radii of ~28 and 54.5 kpc. The disturbed
morphology indicates that the cluster core may have undergone a merger.
However, despite this disruption the mean radiative cooling time in the centre
is short (~230 Myr) and the morphology is regular on large scales.

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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc