Predicting fully self-consistent satellite richness, galaxy growth and starformation rates from the STastical sEmi-Empirical modeL steel.
Predicting fully self-consistent satellite richness, galaxy growth and starformation rates from the STastical sEmi-Empirical modeL steel.
复制标题
DOI：
10.1093/mnras/stz2956
复制
发表时间：
2019-10
影响因子：
4.8
通讯作者：
P. Grylls;F. Shankar;J. Leja;N. Menci;B. Moster;P. Behroozi;L. Zanisi
中科院分区：
文献类型：
--
作者：
P. Grylls;F. Shankar;J. Leja;N. Menci;B. Moster;P. Behroozi;L. Zanisi
观测系统学与理论模型的比较使星系演化的理解受到限制。特别是，不同的经验确定的恒星质量函数意味着不同的映射之间的星系和晕质量，导致不同的星系演化轨迹。使用我们的国家的最先进的统计学的经验模型，钢，我们展示了完全自洽的模型能够产生星系的生长历史，同时和密切同意卫星丰富度和恒星形成率在多个红移和环境的最新数据。中央星系的历史产生的中央晕质量轨迹，从国家的最先进的统计暗物质吸积的历史，再加上丰度匹配例程。我们表明，过于平坦的高质量的斜率输入恒星质量晕质量的关系，如以前的作品所预测的，意味着非物理恒星质量增长的历史弱于那些暗示的卫星吸积。我们的最佳拟合模型再现了探测到的最大质量和最高红移的卫星分布，关于星星形成率及其在局部宇宙中的双模态的最新数据，以及椭圆星系的正确比例。我们的研究结果是重要的预测强大的和自洽的恒星质量晕质量的关系，并产生可靠的星系模拟目录的下一代的河外星系调查，如欧几里得和LSST。
Observational systematics complicate comparisons with theoretical models limiting understanding of galaxy evolution. In particular, different empirical determinations of the stellar mass function imply distinct mappings between the galaxy and halo masses, leading to diverse galaxy evolutionary tracks. Using our state-of-the-art STatistical sEmi-Empirical modeL, steel, we show fully self-consistent models capable of generating galaxy growth histories that simultaneously and closely agree with the latest data on satellite richness and star-formation rates at multiple redshifts and environments. Central galaxy histories are generated using the central halo mass tracks from state-of-the-art statistical dark matter accretion histories coupled to abundance matching routines. We show that too flat high-mass slopes in the input stellar-mass-halo-mass relations as predicted by previous works, imply non-physical stellar mass growth histories weaker than those implied by satellite accretion alone. Our best-fit models reproduce the satellite distributions at the largest masses and highest redshifts probed, the latest data on star formation rates and its bi-modality in the local Universe, and the correct fraction of ellipticals. Our results are important to predict robust and self-consistent stellar-mass-halo-mass relations and to generate reliable galaxy mock catalogues for the next generations of extra-galactic surveys such as Euclid and LSST.