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  • Galaxy evolution in the met...
    Kraljic, K; Arnouts, S; Pichon, C; Laigle, C; de la Torre, S; Vibert, D; Cadiou, C; Dubois, Y; Treyer, M; Schimd, C; Codis, S; de Lapparent, V; Devriendt, J; Hwang, H. S; Le Borgne, D; Malavasi, N; Milliard, B; Musso, M; Pogosyan, D; Alpaslan, M; Bland-Hawthorn, J; Wright, A. H

    Monthly Notices of the Royal Astronomical Society, 02/2018, Volume: 474, Issue: 1
    Journal Article

    Abstract The role of the cosmic web in shaping galaxy properties is investigated in the Galaxy And Mass Assembly (GAMA) spectroscopic survey in the redshift range 0.03 ≤ z ≤ 0.25. The stellar mass, u − r dust corrected colour and specific star formation rate (sSFR) of galaxies are analysed as a function of their distances to the 3D cosmic web features, such as nodes, filaments and walls, as reconstructed by DisPerSE. Significant mass and type/colour gradients are found for the whole population, with more massive and/or passive galaxies being located closer to the filament and wall than their less massive and/or star-forming counterparts. Mass segregation persists among the star-forming population alone. The red fraction of galaxies increases when closing in on nodes, and on filaments regardless of the distance to nodes. Similarly, the star-forming population reddens (or lowers its sSFR) at fixed mass when closing in on filament, implying that some quenching takes place. These trends are also found in the state-of-the-art hydrodynamical simulation Horizon-AGN. These results suggest that on top of stellar mass and large-scale density, the traceless component of the tides from the anisotropic large-scale environment also shapes galactic properties. An extension of excursion theory accounting for filamentary tides provides a qualitative explanation in terms of anisotropic assembly bias: at a given mass, the accretion rate varies with the orientation and distance to filaments. It also explains the absence of type/colour gradients in the data on smaller, non-linear scales.