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Paper detail

The formation of shell galaxies similar to NGC 7600 in the cold dark matter cosmogony

We present new deep observations of 'shell' structures in the halo of the nearby elliptical galaxy NGC 7600, alongside a movie of galaxy formation in a cold dark matter universe (available at http://www.virgo.dur.ac.uk/shell-galaxies). The movie, based on an ab initio cosmological simulation, shows how continuous accretion of clumps of dark matter and stars creates a swath of diffuse circumgalactic structures. The disruption of a massive clump on a near-radial orbit creates a complex system of transient concentric shells which bare a striking resemblance to those of NGC 7600. With the aid of the simulation we interpret NGC 7600 in the context of the CDM model.

preprint2011arXivOpen access
Andrew P. CooperDavid Martinez-DelgadoJohn HellyCarlos FrenkShaun ColeKen CrawfordStefano ZibettiJulio A. Carballo-BelloR. Jay Gabany
astro-ph.COastro-ph.GA
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Andrew P. CooperDavid Martinez-DelgadoJohn HellyCarlos FrenkShaun ColeKen CrawfordStefano ZibettiJulio A. Carballo-BelloR. Jay Gabany

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