Galaxy Triplets Alignment in Large-scale Filaments
Monthly Notices of the Royal Astronomical Society: Letters(2024)
摘要
Leveraging the datasets of galaxy triplets and large-scale filaments obtained
from the Sloan Digital Sky Survey, we scrutinize the alignment of the three
sides of the triangles formed by galaxy triplets and the normal vectors of the
triplet planes within observed large-scale filaments. Our statistical
investigation reveals that the longest and median sides of the galaxy triplets
exhibit a robust alignment with the spines of their host large-scale filaments,
while the shortest sides show no or only weak alignment with the filaments.
Additionally, the normal vectors of triplets tend to be perpendicular to the
filaments. The alignment signal diminishes rapidly with the increasing distance
from the triplet to the filament spine, and is primarily significant for
triplets located within distances shorter than 0.2 Mpc/h, with a confidence
level exceeding 20σ. Moreover, in comparison to compact galaxy triplets,
the alignment signal is more conspicuous among the loose triplets. This
alignment analysis contributes to the formulation of a framework depicting the
clustering and relaxation of galaxies within cosmological large-scale filament
regimes, providing deeper insights into the intricate interactions between
galaxies and their pivotal role in shaping galaxy groups.
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