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Cafe Club

5 octobre à 11h00 - 12h00


Elena SARPA (CPPM, Marseille): « Following galaxies trough the cosmic web ».

The cafe-club will take place at 11:00 am in the Library at LAM and on usual AMU virtual room:

You can find the schedule of upcoming café-clubs and the video of old ones at

Take care,
Carlo, Mathilde, Meriam, Diana


I will present a novel application of the extended Fast Action Minimization method (eFAM) aimed at assessing the role of the environment in shaping galaxy evolution (Sarpa et al. 2022, MNRAS, 516, 231). We apply eFAM to a simulated galaxy catalogue at z=0 extracted from the Magneticum hydrodynamical simulation to retrieve the past, non-linear trajectories of « observed » galaxies (positions and velocities as a function of time) and simultaneously estimate the past density field at different redshifts. We then use the density information to infer the evolution of the large scale cosmic web.

To study the effect of the environment on the observed galaxy properties we reconstruct the environmental history of individual galaxies by tracing their trajectories through cosmic structures. Focusing on the gas fraction, we find that in cluster members it decreases as a function of the redshift of accretion; in agreement with simulations, this suggests that galaxies keep losing their gas content as they orbit within the cluster. Filament galaxies show a similar trend, proving that eFAM successfully traces the galaxy’s gas depletion in filaments as in clusters. Our results establish eFAM as a valuable tool for studying the environmental dependence of observed galaxy properties, offering a complementary approach to that based on light-cone observations.


5 octobre
Heure :
11h00 - 12h00
Catégorie d’Évènement: