Dust Emission from the Lensed Lyman Break Galaxy cB58
Abstract
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.
- Publication:
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American Astronomical Society Meeting Abstracts
- Pub Date:
- December 2000
- Bibcode:
- 2000AAS...197.6505B