http://arxiv.org/abs/2210.16112
Galaxy populations are known to exhibit a strong colour bimodality, corresponding to blue star-forming and red quiescent subpopulations. The relative abundance of the two populations has been found to vary with stellar mass and environment. In this paper, we explore the effect of environment considering different types of measurements. We choose a sample of 49, 911 galaxie with $0.05 < z < 0.18$ from the Galaxy And Mass Assembly survey. We study the dependence of the fraction of red galaxies on different measures of the local environment as well as the large-scale “geometric” environment arXiv:1412.2141 [astro-ph.CO] defined by density gradients in the surrounding cosmic web. We find that the red galaxy fraction varies with the environment independently of stellar mass. The local environmental measures exhibit a larger variation in red fraction from lower to higher density, as compared to the geometric environment. By comparing the different environmental densities pairwise, we show that no density measurement fully explains the observed environmental red fraction variation, suggesting the different densities contain different information. We test whether the local environmental measures, when combined together, can explain all the observed environmental red fraction variation. The geometric environment has a small residual effect, and this effect is larger for voids than any other type of geometric environment. This could provide a test of the physics applied to cosmological-scale galaxy evolution simulations as it combines large-scale effects with local environmental impact.
P. Bhambhani, I. Baldry, S. Brough, et. al.
Mon, 31 Oct 22
40/60
Comments: submitted to MNRAS; 15 pages; 12 figures; 1 table; comments welcome
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