Evolution of central galaxy alignments in simulations

被引:6
作者
Rodriguez, F. [1 ,2 ]
Merchan, M. [1 ,2 ]
Artale, M. C. [3 ]
机构
[1] Consejo Nacl Invest Cient & Tecn, Inst Astron Teor & Expt IATE, Laprida 854,X5000BGR, Cordoba, Argentina
[2] Univ Nacl Cordoba UNC, Observ Astron Cordoba OAC, Laprida 854,X5000BGR, Cordoba, Argentina
[3] Univ Andres Bello, Fac Ciencias Exactas, Dept Ciencias Fis, Inst Astrofis, Ave Fernandez,Concha 700, Santiago, Chile
关键词
methods: statistical; galaxies: groups: general; galaxies: halos; galaxies: high-redshift; dark matter; large-scale structure of Universe; TIDAL-TORQUE THEORY; DARK-MATTER HALOES; ILLUSTRISTNG SIMULATIONS; INTRINSIC ALIGNMENTS; GALACTIC CONFORMITY; SATELLITE GALAXIES; ELLIPTIC GALAXIES; STAR-FORMATION; ASSEMBLY BIAS; HOT GAS;
D O I
10.1051/0004-6361/202450597
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. Observations suggest that red central galaxies align closely with their group galaxies and the large-scale environment. This finding was also replicated in simulations, which added information about the alignment of the stars that form the galaxies with the dark matter in the halo they inhabit. These results were obtained for the present Universe. Our study aims to build upon previous findings by examining the evolution of central galaxy alignment with the environment, as well as the alignment between the stellar and dark matter components. Aims. Based on previous studies, in this work, we describe the evolution of the alignment of bright central galaxies over time and try to understand the process leading to the current observed alignment. Methods. By employing the merger trees from the simulation, we tracked the alignment evolution of the central galaxy sample at z = 0 used in a previous study, the results of which correspond to observations. In particular, we exploited the anisotropic correlation function to study the alignment of the central galaxies with their environment and the probability distribution of the angle between the axes of the shape tensor calculated for each component to deepen the analysis of the stellar and dark matter components. Results. We provide a description of the evolution of alignment in bright central galaxies with a focus on the distinctions between red and blue galaxies. Furthermore, we find that the alignment of the dark matter halo differs from that of the stellar material within it. According to these findings, the assembly process and mergers influenced the evolution of the alignment.
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页数:11
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