Lyman-alpha clouds

Lyman-alpha clouds

(lÿ -măn) See quasar.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
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Collectively the Lyman-alpha clouds impose a complex of absorption lines known as the "Lyman-alpha forest" on the visible light spectrum of the distant quasar [7].
Models of gravitational clustering in the early universe predict different distributions of these Lyman-alpha clouds depending on how much mass is assigned to the neutrinos that were spawned from the Big Bang.
He and his colleagues report in the April 1 Astrophysical Journal that some Lyman-alpha clouds, rather than residing between galaxies, actually constitute vast halos around galaxies.
Totally unexpected was the early profusion of what are now called Lyman-alpha clouds - tenuous, highly ionized clouds poor in heavy elements that once filled the spaces between major galaxies.
Galaxy counterparts for more distant Lyman-alpha clouds remain to be identified - if indeed they exist!