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New insights into the photometric structure of Blue Compact Dwarf Galaxies from a deep Near-Infrared study

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Abstract

We present deep Near-Infrared (NIR) imaging of Blue Compact Dwarf Galaxies (BCDs), allowing for the first time to derive and systematize the NIR structural properties of their stellar low-surface brightness (LSB) host galaxies. Compared to optical data, NIR images, being less contamined by the extended stellar and ionized gas emission from the starburst, permit to study the LSB host galaxy closer to its center. We find that radial surface brightness profiles (SBPs) of the LSB hosts show at large radii a mostly exponential intensity distribution, in agreement with previous optical studies. At small to intermediate radii, however, the NIR data reveal an inwards flattening with respect to the outer exponential slope (`type V SBPs', Binggeli and Cameron, 1991) in the LSB component of more than one half of the sample BCDs. This result may constitute an important observational constraint to the dynamics and evolution of BCDs. We apply a modified exponential fitting function (Papaderos et al., 1996a) to parametrize and systematically study type V profiles in BCDs. A Sérsic law is found to be less suitable for studying the LSB component of BCDs, since it yields very uncertain solutions.

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References

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Authors and Affiliations

  1. Universitäts-Sternwarte Göttingen, Germany

    K.G. Noeske, P. Papaderos, L.M. Cairós & K.J. Fricke

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  1. K.G. Noeske
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  2. P. Papaderos
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  3. L.M. Cairós
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  4. K.J. Fricke
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Noeske, K., Papaderos, P., Cairós, L. et al. New insights into the photometric structure of Blue Compact Dwarf Galaxies from a deep Near-Infrared study. Astrophysics and Space Science 284, 615–618 (2003). https://doi.org/10.1023/A:1024070325567

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  • DOI: https://doi.org/10.1023/A:1024070325567

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