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A.J. Baker, D. Lutz, R. Genzel, L.J. Tacconi, M.D. Lehnert (MPE Garching)
We detect 1.2\,mm continuum emission from dust in the gravitationally lensed Lyman break galaxy MS\,1512+36-cB58. Our detected flux is surprisingly low: relative to local starburst galaxies, cB58 appears to produce less far-IR emission than its UV reddening predicts. Since all of the source's properties except its UV reddening match those expected for a young starburst with little dust, we conclude that its UV spectral slope is an unreliable indicator of its UV extinction. Alternate scenarios to account for the far-IR shortfall which rely on a high dust temperature or differential magnification are less satisfactory. Our result underscores the risks inherent in characterizing the cosmic star formation history from rest-UV observations alone.
This work has been supported by the Max Planck Society.
The author(s) of this abstract have provided an email address for comments about the abstract: ajb@mpe.mpg.de