The clustering of faint blue galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxies, Clusters, General-Galaxies, Formation-Cosmology, Theory.

Scientific paper

Deep CCD images have revealed a population of faint blue galaxies which have a high surface density. In an Einstein-de Sitter universe, the observations require that these galaxies have a higher space density and are less strongly clustered than normal luminous galaxies observed at the present day. We use a series of N-body simulations to show that in a hierarchical theory of galaxy formation, such as the cold dark matter model, these observations can be explained if the faint blue galaxies are a transient population associated with dark haloes of low masses and circular speeds (M_H<~10^12 M_, upsilon_c<~100 km s^-1).

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