Stéphane Arnouts
Lab. Astroph. Marseille (LAM) (Marseille, France)
While galaxy properties are known to correlate with their local environment, it is still debated whether the anisotropic structures of the cosmic web influence galaxy properties.
In the local universe, the recent measurement of the spin alignement of galaxies with their host filaments was a first illustration that coherent large scale streams can advect angular momentum into galactic discs, as predicted by theory and observed in numerical simulations. Beyond the galaxy spin, can we detect the influence of the CW in other galaxy properties ?
In this talk, I will discuss our recent results on the relationship between cosmic web and galaxy properties, based on the large spectroscopic surveys SDSS, GAMA (z<0.3) and VIPERS (z~0.8). By analyzing galaxy properties in the metric of the cosmic web (distance to nodes, filaments and walls), segregation effects are observed beyond the mere effect of the density. These environmental effects are discussed in the current paradigm of galaxy assembly and should be considered to better understand galaxy evolution. I will discuss the perspective in this field with future spectroscopic surveys like PFS and also with large imaging surveys where accurate photometric redshifts can be obtained thanks to new approaches such as deep learning method.
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris