论文标题
欧洲蛋黄酱分解：使用Illustristng跟踪观测动机的中央星形星系样品的淬火
The breakBRD Breakdown: Using IllustrisTNG to Track the Quenching of an Observationally-Motivated Sample of Centrally Star-Forming Galaxies
论文作者
论文摘要
观察到的碎石（“红色磁盘中的浮肿”）星系是附近的面向圆盘星系的样本，特别集中恒星形成：它们具有红色磁盘，但在其中心的近期恒星形成，由D $ _N $ _N $ 4000的光谱索引（Tuttle＆Tonnesen＆Tonnesen 2020）衡量。在本文中，我们在Illustristng模拟中搜索了Breakbrd类似物，并描述了它们的历史和未来。我们发现，一个小的分数（$ {\ sim} 4 \％$ at $ z = 0 $; $ {\ sim} 1 \％$ at $ z = 0.5 $）的星系符合与观察的一致。与大规模加权的父插图样品相比，这些星系倾向于由较高的卫星和飞溅星系组成。但是，中央，非裂开的曲折星系显示出相似的环境，黑洞质量和合并速率，表明没有单个地层触发恒星形成和外部淬火。我们确定整体上是纠缠的模拟星系在淬火过程中。在当前静止或恒星形成的星系的历史上，欧洲束缚状态具有高度集中的恒星形成 - 并不常见。但是，$ 10^{10} <m_ \ ast/m _ {\ odot} <10^{11} $ quiescent星系$ z = 0 $的$ 10^{10} <m_ \ a ast/m _ \ ast/m _ \ ast/m _ \ ast/m _ \ ast = 0 $中的大约10％经历了与过去的SFR浓度相当的SFR浓度。此外，七角状状态是短暂的，持续了几百Myr至$ {\ sim} 2 $ gyr。因此，观察到的欧洲七根星系可能是外部淬火星系的独特样本。
The observed breakBRD ("break bulges in red disks") galaxies are a nearby sample of face-on disk galaxies with particularly centrally concentrated star formation: they have red disks but recent star formation in their centers as measured by the D$_n$4000 spectral index (Tuttle & Tonnesen 2020). In this paper, we search for breakBRD analogues in the IllustrisTNG simulation and describe their history and future. We find that a small fraction (${\sim}4\%$ at $z=0$; ${\sim}1\%$ at $z=0.5$) of galaxies fulfill the breakBRD criteria, in agreement with observations. In comparison with the mass-weighted parent IllustrisTNG sample, these galaxies tend to consist of a higher fraction of satellite and splashback galaxies. However, the central, non-splashback breakBRD galaxies show similar environments, black hole masses, and merger rates, indicating that there is not a single formation trigger for inner star formation and outer quenching. We determine that breakBRD analogue galaxies as a whole are in the process of quenching. The breakBRD state - with its highly centrally concentrated star formation - is uncommon in the history of either currently quiescent or star-forming galaxies; however, approximately 10% of $10^{10} < M_\ast/M_{\odot} < 10^{11}$ quiescent galaxies at $z=0$ have experienced SFR concentrations comparable to those of the breakBRDs in their past. Additionally, the breakBRD state is short-lived, lasting a few hundred Myr up to ${\sim}2$ Gyr. The observed breakBRD galaxies may therefore be a unique sample of outside-in quenching galaxies.
