Issue |
A&A
Volume 377, Number 1, October I 2001
|
|
---|---|---|
Page(s) | 66 - 72 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20011088 | |
Published online | 15 October 2001 |
The deeply embedded starburst in SBS 0335-052*
1
CAISMI-CNR, Largo E. Fermi 5, 50125 Firenze, Italy
2
European Southern Observatory (ESO), Alonso de Cordova 3107, Santiago, Chile e-mail: lvanzi@eso.org
3
Astronomy Department, University of Virginia, Charlottesville, VA 22903, USA e-mail: txt@virginia.edu
Corresponding author: L. K. Hunt, hunt@arcetri.astro.it
Received:
20
April
2001
Accepted:
26
July
2001
We present 4 μm ISAAC imaging and spectroscopy
of the extremely metal-poor dwarf galaxy SBS 0335-052, aimed
at a better understanding of the dust in this low-metallicity galaxy.
The 4 μm emission turns out to be very compact,
confined to the brightest pair of Super Star Clusters (SSCs).
The Ks-L′
color is extremely red, and the
emission
is consistent with the extrapolation of the ISO mid-infrared
spectral energy distribution (SED).
From hydrogen recombination lines and a fit to the near-/mid-infrared
SED, we confirm a visual extinction of
15 mag.
Our data suggest that the sites of the optical and infrared emission
are distinct: the optical
spectral lines come from an almost dustless
region with a high star formation rate and a few thousand
OB stars.
This region lies
along the line-of-sight to a very dusty central star cluster in which there
are more than three times as many massive stars, completely hidden
in the optical.
From the extinction, we derive an upper limit for the
dust mass of 105
which could
be produced by recent supernovae.
Key words: galaxies: dwarf / galaxies: ISM / galaxies: starburst / galaxies: star clusters / galaxies: individual: SBS 0335-052
© ESO, 2001
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