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 (47)

• The cosmological simulation code GADGET-2
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Planck 2013 results. I. Overview of products and scientific results
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• The persistent cosmic web and its filamentary structure I: Theory and implementation
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• The EAGLE simulations of galaxy formation: public release of halo and galaxy catalogues
• Percolation Galaxy Groups and Clusters in the SDSS Redshift Survey: Identification, Catalogs, and the Multiplicity Function
• Tidally-Triggered Star Formation in Close Pairs of Galaxies
• Detecting filamentary pattern in the cosmic web: a catalogue of filaments for the SDSS
• Multiscale Phenomenology of the Cosmic Web
• The persistent cosmic web and its filamentary structure II: Illustrations
• Galaxy Pairs in the 2dF Survey I. Effects of Interactions in the Field
• Galaxy spin alignment in filaments and sheets: observational evidence
• Galaxy Pairs in the Sloan Digital Sky Survey - II: The Effect of Environment on Interactions
• The spin and orientation of dark matter halos within cosmic filaments
• Evidence for spin alignment of spiral and elliptical/S0 galaxies in filaments
• The Cosmic Web: Geometric Analysis
• Alignments of galaxies within cosmic filaments from SDSS DR7
• The Cosmic Ballet: spin and shape alignments of haloes in the cosmic web
• Fossil evidence for spin alignment of SDSS galaxies in filaments
• Galaxy Pairs in the 2dFGRS II. Effects of interactions on star formation in groups and clusters
• The cosmic web and the orientation of angular momenta
• 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
• Large-scale mass distribution in the Illustris simulation
• Effects of galaxy interactions in different environments
• Alignment of galaxies relative to their local environment in SDSS-DR8
• Alignment between filaments and galaxy spins from the MaNGA integral-field survey
• Detecting Galaxy-Filament Alignments in the Sloan Digital Sky Survey III
• The Luminosity, Colour and Morphology dependence of galaxy filaments in the Sloan Digital Sky Survey Data Release Four
• The dependence of galaxy group star formation rates and metallicities on large scale environment
• Exploring galaxy colour in different environments of the cosmic web with SDSS
• A New Algorithm for the Detection of Inter-cluster Galaxy Filaments using Galaxy Orientation Alignments
• 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
• Supercluster A2142 and collapse in action - infalling and merging groups and galaxy transformations
• Alignment between Luminous Red Galaxies and surrounding structures at $z\sim 0.5$
• A study on the statistical significance of mutual information between morphology of a galaxy and its large-scale environment
• The orientation of galaxy pairs with filamentary structures: dependence on morphology
• 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
• A New Perspective on the Large-Scale Tidal Effect on the Galaxy Luminosity and Morphology
• 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

Cited by in corpus (2)

• Probing large-scale structures with the two-point function and the power spectrum: insights into cosmic clustering evolution
• A semi-analytic estimate for the effective sound speed counterterm in the EFTofLSS