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OATS-UNI/TS SEMINAR
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Speaker: Anna Pasquali (Heidelberg Univ., Germany)

Title: Observed properties of satellite galaxies
Date: Wednesday, April 16th, 2014
Time: 11:30
Venue: Villa Bazzoni
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Abstract It is by now well established that galaxy evolution is driven by intrinsic processes (nature) and environment (nurture), both contributing to shape the observed properties of galaxy populations. A number of early studies have proven the role of environment (defined in terms of local density) by showing that massive galaxies, with older stellar populations, preferentially reside in high-density regions, while galaxies actively forming stars populate low-density environments. On the theory side, models of galaxy formation and evolution have indicated that galaxies within the same environment do not evolve similarly. Contrary to their central (most massive) galaxy in a group/cluster, satellite galaxies are stripped off their gas and stellar mass, and have their star formation quenched by their environment. Large samples of observed galaxies like the SDSS now allow us to address environment also in terms of central and satellite galaxies. Specifically, we can use the observed properties of satellites to investigate the impact of satellite specific transformation processes. In this framework, I will summarize recent results on environmental effects, obtained from the DR4 group catalogue of Yang et al. (2007), by comparing the properties of centrals and satellites as a function of their stellar mass and the dark matter mass of their host halos.
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Contact: Gabriella De Lucia (OATS)