标题： 类似星系天体的恒星形成分析 显示英文标题

标题： Analysis of Star Formation in Galaxy-like Objects

摘要： 利用宇宙学流体力学模拟，我们研究了等级聚集对类似星系的天体触发恒星形成的影响。 我们引入了一个简单的恒星形成模型，将密集区域中的冷气体转化为恒星。 为了量化结果对参数的依赖性，进行了具有不同参数的模拟。 然后，我们求助于恒星群体综合模型，以追踪每个天体随红移的颜色演化以及与其合并历史的关系。 我们发现，在等级聚集中，结构组装的过程是一种可能触发恒星形成的自然机制。 每个单独的星系天体的恒星形成率历史由一个连续过程（$\leq 3 \rm{M_{\odot}/yr}$）和一系列恒星爆发组成。 我们发现，即使一个小卫星的吸积也可能与恒星爆发相关联。 大规模合并被发现更有效地将气体转化为恒星。 显示英文摘要

摘要： Using cosmological hydrodynamical simulations, we investigate the effects of hierarchical aggregation on the triggering of star formation in galactic-like objects. We include a simple star formation model to transform the cold gas in dense regions into stars. Simulations with different parameters have been performed in order to quantify the dependence of the results on the parameters. We then resort to stellar population synthesis models to trace the color evolution of each object with red-shift and in relation to their merger histories. We find that, in a hierarchical clustering scenario, the process of assembling of the structure is one natural mechanism that may trigger star formation. The resulting star formation rate history for each individual galactic object is composed of a continuous one ($\leq 3 \rm{M_{\odot}/yr}$) and a series of star bursts. We find that even the accretion of a small satellite can be correlated with a stellar burst. Massive mergers are found to be more efficient at transforming gas into stars