Galaxy evolution in the metric of the Cosmic Web
| Autor: | 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., Borgne, D. Le, Malavasi, N., Milliard, B., Musso, M., Pogosyan, D., Alpaslan, M., Bland-Hawthorn, J., Wright, A. H. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | MNRAS 474 (2018) 1, 547-571 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stx2638 |
| Popis: | The role of the cosmic web in shaping galaxy properties is investigated in the GAMA spectroscopic survey in the redshift range $0.03 \leq z \leq 0.25$. 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. Comparable 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. Comment: 26 pages, 18 figures, 7 tables, accepted for publication in MNRAS |
| Databáze: | arXiv |
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