Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-16
Astronomy and Astrophysics
Astrophysics
14 page review presented at the Cosmology Symposium held in Kyoto in April 2001--proceedings to be published. includes 14 figu
Scientific paper
The two major functions in galaxy evolution that we would like to measure are the stellar populations in galaxies, and their time-derivative, the star formation rate. Especially at redshifts above 1, both of these measures are benefiting greatly from wide-area infrared data. To date, most of these infrared observations suggest that a significant fraction of the star formation suffers substantial internal extinction from dust. Ground-based illustrations include optical/infrared photometric redshift estimates of Balmer-break galaxies, and near-infrared narrow-band imaging and spectroscopy of emission lines redshifted from the optical rest frame. Space-based examples include slitless spectroscopic surveys for H-alpha line emission, mid- and far-infrared diffuse background measurements and deep number counts, and searches for starlight from damped Lyman-alpha absorbers.
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