The seeds of rich galaxy clusters in the Universe

Article Abstract:

It is possible to use semi-analytic modelling and n-body simulations to indicate that large concentrations of primeval galaxies should occur quite frequently in a universe dominated by cold dark matter. These concentrations can be regarded as the progenitors of the rich galaxy clusters in existence in modern times. The discovery of Lyman-break galaxies suggests that the formation sites of most of the stars in the Universe have now been determined. There is now indisputable evidence for biased galaxy formation.

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Questions of clusters

Article Abstract:

Observations of the colliding giant spirals NGC4038 and NGC4039 with the Hubble Space Telescope suggest that collisions between gas-rich galaxies merely contribute to the rate of normal star and cluster formation. The blue clusters in these two spirals are larger than Galactic globular cluster and the differences are due to increase in radii of young clusters with time by rapid mass-loss in fast-evolving young stars.

Usage, Hubble Space Telescope (Artificial satellite)

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X-ray clusters of galaxies as tracers of structure in the Universe

Article Abstract:

The use of X-ray emissions to investigate the mass distribution of a portion of the Universe is discussed.

Research, Cosmography

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