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Probing the evolution of galaxies using redshifted H-alpha emission | | Paul P. van der Werf
; Alan F.M. Moorwood
; Lin Yan
; | | Date: |
9 Aug 2001 | | Subject: | astro-ph | | Affiliation: | Leiden Observatory), Alan F.M. Moorwood (ESO) and Lin Yan (SIRTF Science Center | | Abstract: | In this paper we review the present status and implications of H-alpha surveys at various redshifts. With the advent of sensitive wide-format near-infrared detectors on large telescopes, deep and extensive H-alpha surveys are now feasible to redshift z~2.5. The cosmic star formation history can therefore be traced out to this redshift using H-alpha alone, avoiding complications arising from the comparison of different tracers at different redshifts. The H-alpha surveys to date confirm the rapid increase in luminosity density from z=0 out to z=1, and show that this increase flattens off at higher redshifts, remaining approximately constant out to at least z~2.2. We also discuss the prospects for determining the masses of high redshift galaxies based on emission lines. A set of high-quality H-alpha rotation curves of samples of disk galaxies at a number of different redshifts would allow a study of the evolution of the Tully-Fisher relation and address fundamental issues in disk galaxy formation. Such a program remains challenging even with present-day large telescopes. | | Source: | arXiv, astro-ph/0108161 | | Services: | Forum | Review | PDF | Favorites | |
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