Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subarcsecond Resolution Mid-Infrared Observations of Super Star Clusters
  in the Antennae (NGC4038/4039)   In this letter we present ground-based subarcsecond mid-infrared imaging and
spectroscopy of young super star clusters in the overlap region of the merging
galaxies NGC4038/4039 (the Antennae) obtained with the VLT Imager and
Spectrometer for mid-Infrared (VISIR). With its unprecedented spatial
resolution VISIR begins to resolve the HII/PDR complexes around the
star-forming regions for the first time. In the N-band spectra of two young
star clusters unexpectedly low polycyclic aromatic hydrocarbon (PAH) emission
is observed, compared to what is seen with the Infrared Space Observatory (ISO)
and with the Spitzer Space Telescope. We conclude that a large fraction of the
PAH emission cannot directly be associated with the super star clusters, but
originate from an extended region of at least 215 pc radius around the
clusters. In the distribution of [NeII] 12.81 micron emission a highly obscured
cluster is discovered that does not have an optical or near-infrared
counterpart.

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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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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: econ
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom