NASA NTRS · 19890032206
Protogalaxies
Abstract
It is argued that the observed sample of flat-spectrum galaxies seen in recent deep surveys must contain both early disk systems and early spheroid systems in order to match observed number counts if q sub 0 = 0.5. The low average density of neutral hydrogen in damped L-alpha systems at z = 2 - 3 separates the disk formation at z less than about 2 from spheroid formation at z greater than about 3. Based on color arguments, the period of spheroid formation is assigned to z = 4.
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Cowie, Lennox L.. 1988-01-01. Protogalaxies. https://ntrs.nasa.gov/citations/19890032206
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