A cluster of protogalaxies at redshift 3.4?

Details A cluster of protogalaxies at redshift 3.4? A cluster of protogalaxies at redshift 3.4?

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.359..512s&link_type=abstract

Nature (ISSN 0028-0836), vol. 359, no. 6395, p. 512-514.

Other

6

Galactic Clusters, Galactic Evolution, Radio Galaxies, Red Shift, Absorption Spectra, Dark Matter, Emission Spectra, H I Regions, Lyman Alpha Radiation

Scientific paper

It is proposed that the HZ I emission by Uson et al. (1991) seen at z = 3.4 may be emission from neutral hydrogen in a collection of protogalaxies which are of the type needed to explain the damped Lyman-alpha absorption systems in quasar spectra. The narrowness of the observed emission line implies that the protocluster is near gravitational turnaround, the moment at which it detaches itself form the general cosmic expansion and begins to collapse. The absorption line can arise from a gaseous halo rich in H I around the radio galaxy or from other galaxies in the vicinity.

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