Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-infrared properties of blue compact dwarf galaxies: the link
  between solar and low metallicity   We have obtained near-infrared images and spectra of three blue compact dwarf
galaxies of intermediate sub-solar metallicity Tol~35, Tol~3 and UM 462. This
work is part of a larger project aimed to study the star formation and the
stellar populations of low metallicity galaxies in the near-infrared. In this
frame work galaxies of intermediate metallicity represent an important step in
understanding the most extreme cases filling the gap between solar and very low
metallicity galaxies. We have observed HII region like spectra in all three
galaxies; in all cases the star formation episodes are only a few Myr old.
Consistently with a young age our spectra show no evidence for stellar
absorption features typical of supergiants, nor of [FeII] emission typical of
supernovae. The K-band gas fraction ranges from 20 to 40 % showing that gas
emission can significantly contaminate broadband near-infrared colors in young
metal-poor starbursts. We have detected molecular hydrogen in emission in all
three objects. All sources show bright knots superimposed on a lower surface
brighness envelope. The knots are identified with Super Star Clusters; six of
them are present in UM 462. In all galaxies we detect the presence of an old
stellar population.

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The categories of this paper are: math-ph
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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: econ
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The categories of this paper are: gr-qc
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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: stat
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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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: chao-dyn
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The categories of this paper are: hep-ph