论文标题
通过DECODE测试星系合并率和形态学中恒星质量质量关系的关键作用，这是一种新型的离散统计半经验模型
Testing the key role of the stellar mass-halo mass relation in galaxy merger rates and morphologies via DECODE, a novel Discrete statistical sEmi-empiriCal mODEl
论文作者
论文摘要
合并和恒星形成在调节星系增长中的相对作用仍然是激烈的争论。我们在这里提出了我们的解码，这是一种新的离散统计半经验模型，专门针对任何给定输入恒星质量质量质量质量（SMHM）关系的完整宇宙学环境中快速有效地预测的速度和高效预测。解码会从准确的subhalo质量和所有子宫（包括居住在其他亚屏幕中的统计）中生成对象划分的暗物质合并树（因此），并从精确的subhalo质量和插入红移概率函数（因此）生成对象。然后，通过输入，红移依赖的SMHM关系将合并树转化为星系组装历史，这对Galaxy Stellar质量函数的重要系统和随着宇宙时间的进化非常敏感。当在输入其SMHM关系中采用时，解码可以准确地重现流体动力模拟和半分析模型的预测的平均星系合并率和组装历史。 In the present work we use DECODE to prove that only SMHM relations implied by stellar mass functions characterized by large abundances of massive galaxies and significant redshift evolution, at least at $M_\star \gtrsim 10^{11} \, M_\odot$, can simultaneously reproduce the local abundances of satellite galaxies, the galaxy (major merger) pairs since $z \sim 3 $，以及最亮星系星系的增长。相同的模型还可以重现椭圆星系的局部部分，假设这些模型是由主要合并严格形成的，而不是需要全部凸起的比率分布，这需要其他过程。
The relative roles of mergers and star formation in regulating galaxy growth are still a matter of intense debate. We here present our DECODE, a new Discrete statistical sEmi-empiriCal mODEl specifically designed to predict rapidly and efficiently, in a full cosmological context, galaxy assembly and merger histories for any given input stellar mass-halo mass (SMHM) relation. DECODE generates object-by-object dark matter merger trees (hence discrete) from accurate subhalo mass and infall redshift probability functions (hence statistical) for all subhaloes, including those residing within other subhaloes, with virtually no resolution limits on mass or volume. Merger trees are then converted into galaxy assembly histories via an input, redshift dependent SMHM relation, which is highly sensitive to the significant systematics in the galaxy stellar mass function and on its evolution with cosmic time. DECODE can accurately reproduce the predicted mean galaxy merger rates and assembly histories of hydrodynamic simulations and semi-analytic models, when adopting in input their SMHM relations. In the present work we use DECODE to prove that only SMHM relations implied by stellar mass functions characterized by large abundances of massive galaxies and significant redshift evolution, at least at $M_\star \gtrsim 10^{11} \, M_\odot$, can simultaneously reproduce the local abundances of satellite galaxies, the galaxy (major merger) pairs since $z \sim 3$, and the growth of Brightest Cluster Galaxies. The same models can also reproduce the local fraction of elliptical galaxies, on the assumption that these are strictly formed by major mergers, but not the full bulge-to-disc ratio distributions, which require additional processes.
