Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AGN jets and a fanciful trio of black holes in the Abell 85 Brightest
  Cluster Galaxy   A new radio map of the Abell 85 Brightest Cluster Galaxy (BCG) was obtained
with the Karl G. Jansky Very Large Array (VLA). With a resolution of 0.02",
this radio image shows two kiloparsec-scale bipolar jets emanating from the
active galactic nucleus of the Abell 85 BCG. The galaxy core appears as a
single entity on the new radio map. It has been assumed that the Abell 85 BCG
contained a binary black hole in its core. However, Chandra X-ray data and the
new high-resolution radio map show no evidence that the Abell 85 BCG harbors a
binary black hole. The assumption that this galaxy contains a binary black hole
was based on the analysis of its optical surface brightness profile obtained
under poor seeing conditions. We demonstrate how the well-known blurring
effects of atmospheric seeing can mimic the effects of a binary supermassive
black hole (SMBH). Likewise, SDSS J004150.75-091824.3 was postulated to be "a
third" SMBH associated with the BCG. In the optical and X-rays, SDSS
J004150.75-091824.3 is a point-like source located ~14" away from the nucleus
of the Abell 85 BCG. A new spectrum of SDSS J004150.75-091824.3, obtained with
the 10.4-m Gran Telescopio Canarias, reveals that this source is a background
quasar at a redshift of z=1.560+/-0.003 and not associated in any way with the
Abell 85 cluster.

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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: adap-org