影响近邻星系的机制与环境趋势（MAGNET）
Mechanisms Affecting Galaxies Nearby and Environmental Trends (MAGNET)
AI总结：
研究通过理论框架分析星系演化中的内部和外部机制，揭示不同环境和质量对星系形成和生长的影响，发现不同机制在不同质量和环境中具有显著差异。
摘要：
星系的演化受到内部和外部机制的影响，这些机制调节了重子循环和恒星形成活动。我们基于GAlaxy Evolution and Assembly（GAEA）半解析模型提出了一个理论框架。我们提取了包含孤立星系、双星系、星团和丝状体成员的模拟体积部分，具体避免了大质量团块。星系通过内在（基于暗物质晕）和观测（二维投影）参数化进行分类，从z=2重建其环境历史，并识别了并合、潮汐相互作用、湍流压力剥离（RPS）和星族耗尽。二维信息减少了孤立和星团的比例，同时使双星系的比例翻倍。超过一半的星系自z=2以来未受研究过程影响。在受影响的星系中，高恒星质量（log(M*/Msun) > 10.5）的并合占主导地位（40-60%）。潮汐相互作用较少，其发生率随恒星质量增加而增加。RPS在星团和丝状体中在中等质量（约50%）占主导地位，而星族耗尽在20-30%之间。不同机制的发生率强烈依赖于质量和环境，尽管它们对全球性质的影响往往微妙。不同的演化路径出现：当log(M*/Msun) < 9.5时，星系在星团和丝状体中的质量增长比其他环境的星系更快，尤其是那些经历星族耗尽、并合和少量RPS的星系。在更高质量时，差异减少，尽管在这些质量下，合并和星族耗尽的恒星形成抑制明显。这项理论研究为最近启动的多波段项目Mechanisms Affecting Galaxies Nearby and Environmental Trends（MAGNET）提供了必要的背景，我们在此介绍该项目。
英文摘要：
[ABRIDGED] Galaxy evolution is shaped by internal and external mechanisms that regulate the baryon cycle and star formation activity. We present a theoretical framework based on the GAlaxy Evolution and Assembly (GAEA) semi-analytic model. We extracted portions of simulated volumes that include isolated galaxies, pairs, group, and filament members at z ~ 0, specifically avoiding massive clusters. Galaxies were classified using both intrinsic (halo-based) and observational (2D projected) parameterizations, reconstructing their environmental histories from z = 2 and identifying mergers, tidal interactions, ram pressure stripping (RPS), and starvation. 2D information decreases isolated and group fractions while doubles pairs. More than half of galaxies remain unaffected by the investigated processes since z = 2. Among affected galaxies, mergers dominate at high stellar masses (40-60% at log(M*/Msun) > 10.5). Tidal interactions are less frequent, and their incidence increases with stellar mass. RPS dominates in groups and filaments at intermediate masses (~50%), while starvation ranges from 20 to 30%. The incidence of the different mechanisms depends strongly on both mass and environment, though their imprints on global properties are often subtle. Distinct evolutionary pathways emerge: log(M*/Msun) < 9.5, galaxies in groups and filaments have a faster mass growth than galaxies in the other environments, especially those undergoing starvation, mergers and, to less extent, RPS. Differences are reduced moving to higher masses, where no clear dependence on physical mechanism emerge, even though at these masses a clear star formation suppression is evident in mergers and starved galaxies. This theoretical investigation provides essential context for the recently started multi-wavelength program Mechanisms Affecting Galaxies Nearby and Environmental Trends (MAGNET), which we introduce here.
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