Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rspta.320..503w&link_type=abstract
(Royal Society Discussion on Material Content of the Universe, London, England, Oct. 23, 24, 1985) Royal Society (London), Philo
Astronomy and Astrophysics
Astronomy
26
Baryons, Galactic Evolution, Lyman Alpha Radiation, Absorbers, Astronomical Spectroscopy, Centimeter Waves, Cosmology, Disk Galaxies, Positive Ions, Red Shift
Scientific paper
A new type of survey for galaxies with z > 2 is described. The idea is to search for the spectroscopic imprint that the H I disc of a foreground galaxy leaves on radiation emitted by a background QSO; namely, a Lyman-α absorption line broadened by radiation damping. A continuing survey has revealed the presence of 15 damped Lα lines with redshifts between 1.8 and 2.8 in the spectra of 68 QSOs. The new population is notable for its mass density, which exceeds the sum total of all the baryonic matter previously known at these redshifts. The author suggests that he has detected the progenitors of the baryon content of nearby galaxies. Implications of this discovery for theories of galaxy formation are discussed.
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