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The alignment between satellites and central galaxies has been studied indetail both in observational and theoretical works. The widely accepted fact isthat the satellites preferentially reside along the major axis of their centralgalaxy. However, the origin and large-scale environment dependence of thisalignment are still unknown. In an attempt to figure out those, we use dataconstructed from SDSS DR7 to investigate the large-scale environmentaldependence of this alignment with emphasis on examining the alignments'dependence on the colour of the central galaxy. We find a very stronglarge-scale environmental dependence of the satellite-central alignment ingroups with blue centrals. Satellites of blue centrals in knots arepreferentially located perpendicular to the major axis of the centrals, and thealignment angle decreases with environment namely when going from knots tovoids. The alignment angle strongly depend on the ${}^{0.1}(g-r)$ colour ofcentrals. We suggest that the satellite-central alignment is the result of acompetition between satellite accretion within large scale-structure and galaxyevolution inside host haloes. For groups containing red central galaxies, thesatellite-central alignment is mainly determined by the evolution effect, whilefor blue central dominated groups, the effect of large-scale structure plays amore important role, especially in knots. Our results provide an explanationfor how the satellite-central alignment forms within different large-scaleenvironments. The perpendicular case in groups and knots with blue centrals mayalso provide insight into understanding similar polar arrangements such theformation of the Milky Way and Centaurus A's satellite system.

Alignment between satellite and central galaxies in the SDSS DR7: dependence on large-scale environment