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Title:
Protogalaxies
Authors:
Cowie, Lennox L.
Affiliation:
AA(Hawaii, University, Honolulu)
Publication:
IN: The post-recombination universe; Proceedings of the NATO Advanced Study Institute, Cambridge, England, July 27-Aug. 7, 1987 (A89-19576 06-90). Dordrecht, Kluwer Academic Publishers, 1988, p. 1-18.
Publication Date:
00/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GALACTIC EVOLUTION, RED SHIFT, COMPUTATIONAL ASTROPHYSICS, DISK GALAXIES, LYMAN ALPHA RADIATION, SPHEROIDS, ULTRAVIOLET ABSORPTION
Bibliographic Code:
1988prun.proc....1C

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 q0 = 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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Database: Astronomy
Physics
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