Cold dark matter, the structure of galactic haloes and the origin of the Hubble sequence

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Evolution, Galactic Structure, Hubble Diagram, Missing Mass (Astrophysics), Universe, Astronomical Models, Galactic Clusters

Scientific paper

A popular theory for galaxy formation holds that the Universe is dominated by exotic particles such as axions, photinos or gravitinos (collectively known as cold dark matter, CDM) The resulting model is consistent with the observed dynamics of galaxy clustering only if galaxy formation is biased towards high-density regions. If it is to be viable, it must also account for the structure of individual galaxies and their haloes. The authors describe a simulation of a flat CDM universe which can resolve structures of comparable scale to the luminous parts of galaxies. Such a universe produces objects with the abundance and characteristic properties inferred for galaxy haloes. The results imply that merging plays an important part in galaxy formation and suggest a possible explanation for the Hubble sequence.

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