Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Arc Structures in Chandra Images of NGC5128 (Centaurus A)   We describe results from our initial study of the diffuse X-ray emission
structures in NGC 5128 (Cen A) using the Chandra X-ray Observatory
observations. The high-angular resolution Chandra images reveal multi-scale
X-ray struct ures with unprecedented detail and clarity. The large scale
structures suggest complex symmetry, including a component possibly associated
with the inner radio lobes, and a separate component with an orthogonal
symmetry that may be associated with the galaxy as a whole. We detect arc-like
soft X-ray structures, extending to ~8 kpc in the direction perpendicular to
the jet. These arcs appear to be tracing an ellipse, or a ring seen in
projection, and ar e enclosed between the dust and HI emitting gas in the
central region of the galaxy, and the optical and HI shell fragments at a
distance of about 8-10 kpc. The diffuse X-ray and the optical emission in the
arcs could originate in a region of interaction (possibly a shock) between the
infalling material from the outer regions of the galaxy, and the cool dust and
HI emitting material in the center, or an equatorial outflow resulting from an
outburst of nuclear activity ~10^7 years ago.

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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: cs