The First Quiescent Galaxies in TNG300
The First Quiescent Galaxies in TNG300
复制标题
TNG300 中的第一个静止星系
DOI：
10.1093/mnras/stad1162
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发表时间：
2023
影响因子：
4.8
通讯作者：
C. Williams
中科院分区：
文献类型：
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作者：
Abigail I. Hartley;E. Nelson;K. Suess;Alex M. Garcia;Minjung Park;L. Hernquist;R. Bezanson;R. Nevin;A. Pillepich;Aimee L. Schechter;Bryan A. Terrazas;P. Torrey;S. Wellons;K. Whitaker;C. Williams
我们确定的第一个静止的星系TNG 300，最大的体积的illustrisTNG宇宙学模拟套件，并探讨其淬火过程和时间演化到z = 0。我们发现，第一个恒星质量M* > 3 × 1010 M，比星星形成率sSFR <10− 11 yr −1的静止星系在TNG 300中出现在z = 4.2处。这些星系中星星形成的抑制开始于活动星系核的热反馈模式，在z = 6时，动力学反馈模式在每个星系中作用到z = 4.7，以完成猝灭过程，该过程发生在时间尺度为1.035 Gyr。令人惊讶的是，我们发现这些星系中的大多数并不是它们的z = 0后代的主要祖先;相反，五个星系中的四个在随后的合并中落入更大的星系，红移范围为2.5 < z < 0.2。到z = 0时，这些后代是平均恒星质量为8 × 1011 M <$m的星系团的中心。我们对詹姆斯·韦伯太空望远镜（JWST）定位的第一个淬灭星系进行预测。
We identify the first quiescent galaxies in TNG300, the largest volume of the IllustrisTNG cosmological simulation suite, and explore their quenching processes and time evolution to z = 0. We find that the first quiescent galaxies with stellar masses M* > 3 × 1010M⊙ and specific star formation rates sSFR <10−11yr−1 emerge at z ∼ 4.2 in TNG300. Suppression of star formation in these galaxies begins with a thermal mode of AGN feedback at z ∼ 6, and a kinetic feedback mode acts in each galaxy by z ∼ 4.7 to complete the quenching process, which occurs on a time-scale of ∼0.35 Gyr. Surprisingly, we find that the majority of these galaxies are not the main progenitors of their z = 0 descendants; instead, four of the five galaxies fall into more massive galaxies in subsequent mergers at a range of redshifts 2.5 < z < 0.2. By z = 0, these descendants are the centres of galaxy clusters with average stellar masses of 8 × 1011M⊙. We make predictions for the first quenched galaxies to be located by the James Webb Space Telescope (JWST).