Galaxy-group (halo) alignments from SDSS DR7 and the ELUCID simulation

Abstract

Based on galaxies from the Sloan Digital Sky Survey (SDSS) and subhalos in the corresponding reconstructed region from the constrained simulation of ELUCID, we study the alignment of central galaxies relative to their host groups in the group catalog, as well as the alignment relative to the corresponding subhalos in the ELUCID simulation. Galaxies in observation are matched to dark matter subhalos in the ELUCID simulation using a novel neighborhood abundance matching method. In observation, the major axes of galaxies are found to be preferentially aligned to the major axes of their host groups. There is a color dependence of galaxy-group alignment that red centrals have a stronger alignment along the major axes of their host groups than blue centrals. Combining galaxies in observation and subhalos in the ELUCID simulation, we also find that central galaxies have their major axes to be aligned to the major axes of their corresponding subhalos in the ELUCID simulation. We find that the galaxy-group and galaxy-subhalo alignment signals are stronger for galaxies in more massive halos. We find that the alignments between main subhalos and the SDSS matched subhalo systems in simulation are slightly stronger than the galaxy-group alignments in observation.

11 pages, 12 figures. Accepted for publication in MNRAS

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Cited by in corpus (9)

• Revealing the properties of void galaxies and their assembly using the EAGLE simulation
• Connections between galaxy properties and halo formation time in the cosmic web
• Mass Dependence of Galaxy-Halo Alignment in LOWZ and CMASS
• Galaxy-halo size relation from Sloan Digital Sky Survey Data Release 7 and the ELUCID simulation
• Galaxy Alignments with Surrounding Structure in the Sloan Digital Sky Survey
• Statistical properties of filaments in the cosmic web
• Galaxy and halo properties around cosmic filaments from Sloan Digital Sky Survey Data Release 7 and the ELUCID simulation
• Mock Observations: Three Different Types of Galaxy Alignment in TNG100 Simulations
• ELUCID-DESI I: A Parallel MPI Implementation of the Initial Condition Solver for Large-Scale Reconstruction Simulations