Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low Frequency Radio Observations of X-ray Ghost Bubbles in Abell 2597: A
  History of Radio Activity in the Core   A previous analysis of the Chandra X-ray image of the center of the cooling
core cluster Abell 2597 showed two ``ghost holes'' in the X-ray emission to the
west and northeast of the central radio galaxy PKS 2322-123. Previous radio
observations did not detect any radio emission coming from the interior of the
X-ray holes. We present new low frequency radio observations of Abell 2597. At
330 MHz, radio emission extends into the interior of the western ghost bubble,
but not the northeast one. Our re-analysis of the archival Chandra data shows
evidence for an X-ray tunnel (elongated region of reduced X-ray emission)
extending from near the center of the cD out to the west ghost bubble. We also
detect a smaller X-ray hole to the northeast of the center of the cD and closer
than the outer ghost bubbles. Radio observations at 1.3 GHz show extensions to
the west along the X-ray tunnel toward the west ghost bubble, to the northeast
into the new X-ray hole, and to the northwest. All of these structures are much
larger than the two inner radio lobes seen previously at 8 GHz. The X-ray
tunnel suggests that the west ghost bubble is part of a continuous flow of
radio plasma out from the active galactic nucleus, rather than a detached
buoyant old radio lobe, and thus it may be an intermediate case between an
active radio galaxy and a buoyant lobe.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: econ