Facundo Rodriguez
Evolution of the central galaxy alignment with the environment
Observations indicate that red central galaxies are closely aligned with their group galaxies and the large-scale environment. This alignment has been confirmed through simulations, revealing the alignment of stars forming these galaxies with the dark matter in their halos. Our study builds on these findings by examining the evolution of central galaxy alignment with their environment and the alignment between stellar and dark matter components. This work aims to describe the evolution of bright central galaxy alignment over time and understand the processes leading to the current observed alignment. Using merger trees from simulations, we tracked the alignment evolution of a central galaxy sample at z=0, which was consistent with previous observations. We utilized the anisotropic correlation function to study the alignment with the environment. We analyzed the probability distribution of angles between the axes of the shape tensor for stellar and dark matter components. We describe the evolution of alignment in bright central galaxies, highlighting differences between red and blue galaxies. Our findings show that the alignment of dark matter halos differs from that of the stellar material within them. The assembly process and mergers have influenced the evolution of this alignment.
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Evolution of the central galaxy alignment with the environment