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After extensively explored, broad agreement between observations and theorieshas been reached that satellites are preferentially aligned with major axes oftheir host centrals. There are still some issues unsolved on this topic. Inthis paper, we present studies on satellite spatial distribution. To fairlycompare with observations, we develop a novel galaxy finder and reconstructionalgorithm in hydrodynamical simulation, which is based on the projected mockimage, taking into account the full consideration of the point spread function,pixel size, surface brightness limit, resolution and redshift dimming effects.With galaxy samples constructed using such an algorithm, the satellitealignment is examined by comparing with observational results. It is found thatthe observational alignment can be reproduced for red galaxies, which dominatethe sample in this study, but not for blue galaxies. Satellites' radialdistribution is also investigated. It exhibits that outer satellites withinhost halos show stronger alignment signal than satellites in the inner regions,especially for red satellites, which is in contrast with previous studies. Thedisagreement is mainly due to extra galaxies identified by our new galaxyfinder, which are mainly located in the inner region of host halos. Our studyillustrates that at lower redshift, the alignment strength becomes stronger,while radial distribution curve becomes flatter. This suggests differences inthe evolution of the angular distribution between satellites residing in theinner and outer halos, and implies that the post-infall evolution reduces theoriginal alignment signal, that the impact decreases for satellites with laterinfall times.

Satellite Alignment: III. Satellite Galaxies Spatial Distribution and their Dependence on Redshift with A Novel Galaxy Finder