Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mid-Infrared Imaging of Active Galaxies: Active Nuclei and Embedded Star
  Clusters   High resolution, mid-infrared (MIR) images of a set of nine nearby active
galaxies are presented. The data were obtained with the TIMMI2 instrument
mounted at the ESO 3.6m telescope using a set of N-band narrow filters. The
resulting images have an angular resolution of 0.6"-1". The MIR emission has
been resolved in four galaxies: NGC253, NGC1365, NGC1808 and NGC7469. The
images unveil a circumnuclear population of unknown MIR sources in NGC1365 and
NGC1808, coincident with radio sources. These MIR/radio sources are interpreted
in terms of embedded young star clusters. A high-resolution MIR map of NGC253
is also presented, and enables the identification of a previously unknown MIR
counterpart to the radio nucleus. Extended MIR emission is detected in NGC7469,
and concurs with previous observations in the NIR and radio. For this source,
an interesting morphological difference between the 10.4mic and the 11.9mic
emission is observed, suggesting the presence of a dust-rich micro-bar. Our MIR
images of Circinus do not show resolved emission from the nucleus down to an
angular scale of 0.5". In the case of NGC2992, an upper limit to the extended
MIR emission can be set. Finally, we provide new MIR flux measurements for the
unresolved AGN in NGC5995, IZw1 and IIZw136.

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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an