Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-07-02
Astronomy and Astrophysics
Astrophysics
Latex, 7 encapsulated postscript Figures, uses moriond.sty special macro. Invited talk at the XXXIVrd Recontres de Moriond on
Scientific paper
I review the characteristics of high redshift galaxies, with particular attention to the effects of dust obscuration on the observed light. Galaxies at redshift z~1 and at z>2 are discussed separately, as the accessible information for each redshift range are different. In the z<=1-2 redshift region, data on the H-alpha and mid/far-IR luminosity of the galaxies are becoming increasingly available, effectively complementing the restframe UV data; they offer a better handle on the amount of dust obscuration present in the galaxies, although some ambiguity remains as to the distribution of the dust within the system and the opacity correction factor this implies. At higher redshifts, most of the available data cover the far-UV region only, representing a challenge for a careful assessment of the effects of dust in galaxies. Finally, I discuss the implications of the dust corrections to the star formation rate density of the Universe as a function of redshift.
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