Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..351d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 351-356.
Astronomy and Astrophysics
Astrophysics
20
Absorption Spectra, Emission Spectra, Lyman Alpha Radiation, Quasars, Star Formation, Abundance, Astronomical Spectroscopy, Galactic Evolution, Red Shift, Star Formation Rate
Scientific paper
Narrow band imaging observations have been carried out in an attempt to detect Lyman alpha emission from high-redshift (z = 2.29-2.82) absorbers seen in the spectra of QSOs. No emission has been detected to a limit of 10 to the -16th erg/sq cm s. The derived limits of Lyman alpha emission at z = 2-3 are used to establish constraints on early galaxy revolution by comparing the limits with observations at the current epoch and with observations of absorbers at moderate (z = 0.5) redshifts. The results show that no significant increase of star formation activity takes place from moderate to high redshifts in a q0 = 0.5 universe.
Bowyer Stuart
Buat Veronique
Deharveng Jean Michel
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