Were small galaxies once the dominant cosmological population?

Details Were small galaxies once the dominant cosmological population? Were small galaxies once the dominant cosmological population?

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.354..460c&link_type=abstract

Nature (ISSN 0028-0836), vol. 354, Dec. 12, 1991, p. 460, 461. Research supported by NASA.

Astronomy and Astrophysics

Astronomy

192

Astronomical Spectroscopy, Cosmology, Dwarf Galaxies, Faint Objects, Galactic Evolution, Sky Surveys (Astronomy), Baryons, Luminous Intensity, Red Shift

Scientific paper

Redshifts and K magnitudes have been obtained for a small but complete sample of 22 galaxies with B magnitudes down to 24. In the luminosity range B = 23-24, the B-band galaxy counts are dominated by a population of small blue galaxies at z roughly 0.25, which may collectively contain as much baryonic matter as the normal galaxies. It is possible either that these earlier galaxies have undergone merging to create the present galaxy population, or that they represent a quite different galactic population which has now faded or disappeared. Either possibility has considerable implications for understanding of galaxy formation.

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