Unveiling galaxy pair alignment in cosmic filaments: A 3D exploration using EAGLE simulation

Abstract

We investigate how galaxy pairs are oriented in three dimensions within cosmic filaments using data from the EAGLE simulation. We identify filament spines using DisPerSE and isolate galaxies residing in filamentary environments. Employing a FoF algorithm, we delineate individual filaments and determine their axes by diagonalizing the moment of inertia tensor. The orientations of galaxy pairs relative to the axis of their host filament are analyzed. Our study covers diverse subsets of filaments identified through varying linking lengths, examining how galaxy pairs align with the filament axis across different spatial parameters such as pair separation and distance from the filament spine. We observe a nearly uniform probability distribution for the cosine of the orientation angle, which is nearly identical in each case. We also investigate the effects of redshift space distortions and confirm that the probability distributions remain uniform in both real space and redshift space. To validate our approach, we conduct Monte Carlo simulations using various theoretical probability distributions. Our analysis does not reveal any evidence of preferential alignment of galaxy pairs within cosmic filaments in hydrodynamical simulations.

17 pages, 1 table, 6 figures, updated results presented after correcting a bug in a code that significantly affected our results presented in the earlier version. Accepted in JCAP

References in corpus (17)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• The spin and orientation of dark matter halos within cosmic filaments
• The Alignments of the Galaxy Spins with the Real-Space Tidal Field Reconstructed from the Two Mass Redshift Survey
• Spin alignments of spiral galaxies within the large-scale structure from SDSS DR7
• Alignment of galaxies relative to their local environment in SDSS-DR8
• Alignment between filaments and galaxy spins from the MaNGA integral-field survey
• Galaxy pairs align with galactic filaments
• How much a galaxy knows about its large-scale environment?: An information theoretic perspective
• Brightest group galaxies and the large-scale environment
• Alignment between Luminous Red Galaxies and surrounding structures at $z\sim 0.5$
• The luminosity bias relation from filaments in the Sloan Digital Sky Survey Data Release Four
• Galaxy interactions in filaments and sheets: effects of the large-scale structures versus the local density
• On the origin of red spirals: Does assembly bias play a role?
• Do minor interactions trigger star formation in galaxy pairs?
• Galaxy interactions in filaments and sheets: insights from EAGLE simulations

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