Snapshots of sub-mJy starburst galaxies

Physics

Scientific paper

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Hst Proposal Id #8263 Distant Galaxies

Scientific paper

Some of the most ambitious and widely-cited extragalactic observations in recent years have been the constraints made on the star formation history of the Universe. Madau et al {1996} combined ground-based samples with photometric redshifts and UV dropout galaxies from the HDF to obtain the evolving UV luminosity density and hence star formation rate {SFR}. From this they inferred a peak and subsequent redshift cutoff in this star formation. If correct this is a major result. However, H-alpha and sub-mm surveys find systematically higher star formation rates, calling into question this behaviour: in essence, by selecting in the UV, Madau et al are highly sensitive to dust reddening. We have recently made a new determination of the comoving star formation density at 0

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