Debris streams in the solar neighbourhood as relicts from the formation of the Milky Way

Article Abstract:

It is generally thought that galaxies were formed through gravitational amplification of primordial fluctuations and subsequent merger of small precursor structures. The process is known to continue, with the discovery of the Saggittarius dwarf galaxy. Around 10% of the metal-poor stars in the halo of the Milky Way are believed to come from a single coherent structure, disrupted after the formation of the Galaxy.

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Formation of elliptical galaxies at moderate redshifts

Article Abstract:

Cosmology research using deep optical and near-infrared images indicates that less elliptical galaxies with very red colours exist than theoretical research suggests. Evidence suggests that elliptical galaxies develop in moderate redshifts in dusty conditions. Theories on the formation of hierarchical clustering models of galaxy formation appear to coincide with the creation of elliptical galaxies.

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Formation of molecular gas in the tidal debris of violent galaxy-galaxy interactions

Article Abstract:

Molecular hydrogen was traced by carbon monoxide emission in two tidal dwarf galaxies. The concentration of molecular gas peaked at the same site as the maximum in atomic-hydrogen density. It is likely that the molecular gas formed from the atomic hydrogen, instead of being torn from the interacting galaxies in molecular form.

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