Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolutionary SED diagnostics of starburst galaxies: signature of
  bimodality   We construct an evolutionary spectral energy distribution (SED) model of a
starburst region, from the ultraviolet to submillimetre wavelengths. This model
allows us to derive the star formation rate, optical depth by dust and apparent
effective radius of starburst regions at various wavelengths; as a result, the
intrinsic surface brightness of starburst regions can be derived. Using this
SED model, we analyse 16 UV-selected starburst galaxies and 10 ultraluminous
infrared galaxies. The derived star formation rates and optical depths are
compared with emission line measurements and found to be consistent. The
derived apparent effective radii are also consistent with observations. From
the SED analysis, we find a bimodal property of the star formation rate with
the optical depth and the compactness of stellar distributions. While mild
starbursts have a limiting intrinsic surface brightness L(bol) x r_e^{-2} ~
10^{12} Lsun kpc^{-2}, intense starbursts tend to be more heavily obscured and
concentrated within a characteristic scale of r_e ~ 0.3 kpc. We suggest that
the mild starbursts can be triggered by a self-gravitating disc instability in
which feedback is effective in the shallow gravitational potential. On the
other hand, the intense starbursts can be induced via an external dynamical
perturbation like galaxy merging, in which feedback is less effective due to
the deep gravitational potential attained by the large gas concentration within
the central starburst region.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org