Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatially-resolved spectrophotometric analysis and modelling of the
  Superantennae   We have performed spatially-resolved spectroscopy of the double-nucleated
Ultra-Luminous Infrared Galaxy IRAS 19254-7245, ``the Superantennae'', along
the line connecting the two nuclei. These data are analysed with a spectral
synthesis code, to derive the star formation and extinction properties of the
galaxy. The star formation history (SFH) of the two nuclei is similarly
characterized by two different main episodes: a recent burst, responsible of
the observed emission lines, and an older one, occurred roughly 1 Gyr ago. We
tentatively associate this bimodal SFH with a double encounter in the dynamical
history of the merger. We have complemented our study with a detailed analysis
of the broad band spectral energy distribution of the Superantennae, built from
published photometry, providing the separate optical-to-mm SEDs of the two
nuclei. Our analysis shows that: a) the southern nucleus is responsible for
about 80% of the total infrared luminosity of the system, b) the L-band
luminosity in the southern nucleus is dominated by the emission from an
obscured AGN, providing about 40 to 50% of the bolometric flux between 8 and
1000 microns; c) the northern nucleus does not show evidence for AGN emission
and appears to be in a post-starburst phase. As for the relative strengths of
the AGN and starburst components, we find that, while they are comparable at
FIR and sub-mm wavelengths, in the radio the Sy2 emission dominates by an order
of magnitude the starburst.

10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: eess