Central galaxy alignment with the environment

FACUNDO RODRIGUEZ; MANUEL MERCHÁN; M. CELESTE ARTALE; MOIRA ANDREWS

Córdoba

Congreso; 4th Regional Extragalactic Astronomy Meeting: 60 Years Of The Sersic Law; 2023

Instituto de Astronomía Teórica y Experimental (IATE - UNC/CONICET)

We present the study of the alignment of central galaxies with the surrounding structures and satellite galaxies in their group/halo. To perform this analysis, we use a modified version of the two-point cross-correlation function. We use both observational data from the Sloan survey (SDSS DR16) and simulations (Illustris TNG300-1). The results obtained allow us to relate the alignment to the halo assembly process as it can be explained by a combination of physical processes on different scales: the central galaxy aligns with the dark matter halo it inhabits, and this, in turn, aligns with the surrounding structures on large scales.