Faint blue counts from formation of dwarf galaxies at Z approximately equals 1

Details Faint blue counts from formation of dwarf galaxies at Z approximately equals 1 Faint blue counts from formation of dwarf galaxies at Z approximately equals 1

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf...80b&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 80-81 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

6

Astronomical Models, Cluster Analysis, Dwarf Galaxies, Elliptical Galaxies, Faint Objects, Halos, Dark Matter, Galactic Evolution, Red Shift, Star Formation, Ultraviolet Radiation

Scientific paper

The nature of faint blue objects (FBO's) has been a source of much speculation since their detection in deep CCD images of the sky. Their high surface density argues against them being progenitors of present-day bright galaxies and since they are only weakly clustered on small scales, they cannot be entities that merged together to form present-day galaxies. Babul & Rees (1992) have suggested that the observed faint blue counts may be due to dwarf elliptical galaxies undergoing their initial starburst at z is approximately equal to 1. In generic hierarchical clustering scenarios, however, dwarf galaxy halos (M is approximately 10(exp 9) solar mass) are expected to form at an earlier epoch; for example, typical 10(exp 9) solar mass halos will virialize at z is approximately equal to 2.3 if the power-spectrum for the density fluctuations is that of the standard b = 2 cold dark matter (CDM) model. Under 'ordinary conditions' the gas would rapidly cool, collect in the cores, and undergo star-formation. Conditions at high redshifts are far from 'ordinary'. The intense UV background will prevent the gas in the dwarf halos from cooling, the halos being released from their suspended state only when the UV flux has diminished sufficiently.

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