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• W2144878839 abstract "Recent observations show evidence that high-z (z ∼ 2–3) early-type galaxies (ETGs) are more compact than those with comparable mass at z ∼ 0. Such size evolution is most likely explained by the ‘dry merger sceanario’. However, previous studies based on this scenario cannot consistently explain the properties of both high-z compact massive ETGs and local ETGs. We investigate the effect of multiple sequential dry minor mergers on the size evolution of compact massive ETGs. From an analysis of the Millennium Simulation Data Base, we show that such minor (stellar mass ratio M2/M1 < 1/4) mergers are extremely common during hierarchical structure formation. We perform N-body simulations of sequential minor mergers with parabolic and head-on orbits, including a dark matter component and a stellar component. Typical mass ratios of these minor mergers are |$1/20 < M_{2}/M_{1} leqq 1/10$|⁠. We show that sequential minor mergers of compact satellite galaxies are the most efficient at promoting size growth and decreasing the velocity dispersion of compact massive ETGs in our simulations. The change of stellar size and density of the merger remnants is consistent with recent observations. Furthermore, we construct the merger histories of candidates for high-z compact massive ETGs using the Millennium Simulation Data Base and estimate the size growth of the galaxies through the dry minor merger scenario. We can reproduce the mean size growth factor between z = 2 and z = 0, assuming the most efficient size growth obtained during sequential minor mergers in our simulations. However, we note that our numerical result is only valid for merger histories with typical mass ratios between 1/20 and 1/10 with parabolic and head-on orbits and that our most efficient size-growth efficiency is likely an upper limit." @default.
• W2144878839 created "2016-06-24" @default.
• W2144878839 creator A5024719193 @default.
• W2144878839 creator A5028443602 @default.
• W2144878839 date "2012-10-25" @default.
• W2144878839 modified "2023-10-01" @default.
• W2144878839 title "Dry minor mergers and size evolution of high-z compact massive early-type galaxies" @default.
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• W2144878839 doi "https://doi.org/10.1093/mnras/sts047" @default.
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