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Based on galaxies from the Sloan Digital Sky Survey (SDSS) and subhalos inthe corresponding reconstructed region from the constrained simulation ofELUCID, we study the alignment of central galaxies relative to their hostgroups in the group catalog, as well as the alignment relative to thecorresponding subhalos in the ELUCID simulation. Galaxies in observation arematched to dark matter subhalos in the ELUCID simulation using a novelneighborhood abundance matching method. In observation, the major axes ofgalaxies are found to be preferentially aligned to the major axes of their hostgroups. There is a color dependence of galaxy-group alignment that red centralshave a stronger alignment along the major axes of their host groups than bluecentrals. Combining galaxies in observation and subhalos in the ELUCIDsimulation, we also find that central galaxies have their major axes to bealigned to the major axes of their corresponding subhalos in the ELUCIDsimulation. We find that the galaxy-group and galaxy-subhalo alignment signalsare stronger for galaxies in more massive halos. We find that the alignmentsbetween main subhalos and the SDSS matched subhalo systems in simulation areslightly stronger than the galaxy-group alignments in observation.

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