THE BARYON CYCLE AT HIGH REDSHIFTS: EFFECTS OF GALACTIC WINDS ON GALAXY EVOLUTION IN OVERDENSE AND AVERAGE REGIONS
THE BARYON CYCLE AT HIGH REDSHIFTS: EFFECTS OF GALACTIC WINDS ON GALAXY EVOLUTION IN OVERDENSE AND AVERAGE REGIONS
复制标题
高红移处的重子周期：银河风对高密度和平均区域星系演化的影响
DOI：
10.3847/0004-637x/829/2/71
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
E. Romano
中科院分区：
文献类型：
--
作者：
Raphael Sadoun;I. Shlosman;Jun;E. Romano
我们采用高分辨率的宇宙学放大模拟集中在一个高sigma峰值和一个平均宇宙场在z = 6-12，以研究环境和重子反馈对星系演化的影响，在再电离时代。强烈的反馈，例如，由星星形成率（SFR）升高引起的星系风预计将在这一演变中发挥重要作用。我们比较不同的外流处方：（一）恒定的风速（CW），（二）可变风标度与星系属性（VW），（iii）没有外流（NW）。过密度导致“正常”区域中不存在的暗物质和重子结构加速演化，并导致低质量端的浅星系恒星质量函数。虽然CW表现出对环境的依赖性很小，但更多的物理动机的VW模型确实表现出这种效果。此外，VW可以再现观测到的比SFR（sSFR）和sSFR-恒星质量关系，CW和NW不能同时满足。风在影响星系际介质（IGM）的状态方面也有很大的不同。不同之处在于热的，高金属丰度气体的体积填充因子，这是近1 CW，而这样的气体仍然局限于大规模的细丝为大众，并锁定在星系的NW。这种气体在正常区域几乎不存在。虽然所有的风模型都有不足之处，但VW模型在将外流特性与宿主星系的外流特性相关联方面似乎是有前途的。需要对IGM在高z处的状态进行进一步约束以分离不同的风模型。
We employ high-resolution cosmological zoom-in simulations focusing on a high-sigma peak and an average cosmological field at z ∼ 6–12 in order to investigate the influence of environment and baryonic feedback on galaxy evolution in the reionization epoch. Strong feedback, e.g., galactic winds, caused by elevated star formation rates (SFRs) is expected to play an important role in this evolution. We compare different outflow prescriptions: (i) constant wind velocity (CW), (ii) variable wind scaling with galaxy properties (VW), and (iii) no outflows (NW). The overdensity leads to accelerated evolution of dark matter and baryonic structures, absent from the “normal” region, and to shallow galaxy stellar mass functions at the low-mass end. Although CW shows little dependence on the environment, the more physically motivated VW model does exhibit this effect. In addition, VW can reproduce the observed specific SFR (sSFR) and the sSFR–stellar mass relation, which CW and NW fail to satisfy simultaneously. Winds also differ substantially in affecting the state of the intergalactic medium (IGM). The difference lies in the volume-filling factor of hot, high-metallicity gas, which is near unity for CW, while such gas remains confined in massive filaments for VW, and locked up in galaxies for NW. Such gas is nearly absent from the normal region. Although all wind models suffer from deficiencies, the VW model seems to be promising in correlating the outflow properties with those of host galaxies. Further constraints on the state of the IGM at high z are needed to separate different wind models.
第一个星系的质量演化：CANDELS GOODS-South 场中 4 < z < 7 处的恒星质量函数和恒星形成率
影响因子：
4.8
作者：
Duncan K
通讯作者：
Duncan K