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Group behavior: The case of galaxies

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A key question concerning the evolution of galaxies within the concordance cosmological framework is how this evolution is modulated by the broader environment of a galaxy, i.e. the interaction of galaxies with their dark matter haloes, and the location of galaxies within the cosmic web of large-scale filaments and voids in the Universe. I will present new results from an observational survey of galaxies in groups on the dependence of galaxy properties on halo mass and large-scale environmental density, and a comparison with hydrodynamical numerical simulations that guide us towards an understanding of the physical processes that shape the galaxy population that we observe today.

This talk is part of the Institute of Astronomy Colloquia series.

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