On the filamentary environment of galaxies
C. Gay, C. Pichon, D. Le Borgne, R. Teyssier, T. Sousbie, J. Devriendt
TL;DR
This study uses a large hydrodynamical simulation to explore how galaxy properties, especially color bimodality, relate to their position in the cosmic web, revealing that proximity to large haloes influences galaxy evolution.
Contribution
It provides a detailed analysis of galaxy distribution and properties in relation to the cosmic web structure at redshift 1.5 using the Horizon MareNostrum simulation.
Findings
Galaxies near the skeleton are generally redder.
Color bimodality is linked to ram pressure stripping in clusters.
Proximity to large haloes influences galaxy spectral properties.
Abstract
The correlation between the large-scale distribution of galaxies and their spectroscopic properties at z=1.5 is investigated using the Horizon MareNostrum cosmological run. We have extracted a large sample of 10^5 galaxies from this large hydrodynamical simulation featuring standard galaxy formation physics. Spectral synthesis is applied to these single stellar populations to generate spectra and colours for all galaxies. We use the skeleton as a tracer of the cosmic web and study how our galaxy catalogue depends on the distance to the skeleton. We show that galaxies closer to the skeleton tend to be redder, but that the effect is mostly due to the proximity of large haloes at the nodes of the skeleton, rather than the filaments themselves. This effects translate into a bimodality in the colour distribution of our sample. The origin of this bimodality is investigated and seems to…
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