The survival of stellar discs in Fornax-like environments, from TNG50 to real galaxies
The survival of stellar discs in Fornax-like environments, from TNG50 to real galaxies
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恒星盘在类似 Fornax 的环境中的生存，从 TNG50 到真实的星系
DOI：
10.1093/mnras/stac3061
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发表时间：
2022
影响因子：
4.8
通讯作者：
Galán-De Anta P
中科院分区：
文献类型：
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作者：
Galán-De Anta P
我们研究了从IllustrisTNG宇宙学模拟套件运行的TNG50中确定的10个天炉座类星团中运动学定义的恒星盘的演化。我们考虑了具有现今恒星质量的盘状星系（- - -≥3 × 108M⊙），并跟踪了它们自首次进入宿主星团以来的演化过程。很少有恒星盘在如此密集的环境中幸存下来，从40%幸存到全部被破坏。这样的存活率与之前报道的TNG50中两个更大的类似处女座的星团的存活率一致。然而，从绝对意义上讲，现今天炉星团中碟状星系的数量很少，这可能与实际天炉星团中心区域存在的三个边缘盘状星系不一致，正如Fornax3D调查所描绘的那样。当从随机方向观察天炉星团的类似物时，使用与Fornax3D相同的选择功能，在TNG50的任何一个类似天炉星团中找到三个边缘盘状星系的概率相当低，尽管不是不可能。我们还比较了由天炉座三个边缘的积分场光谱得出的赤道平面附近的恒星种群特性与TNG50中现今盘状星系的类似视距积分值。对于其中一个来说，其盘上非常古老且富含金属的恒星种群无法与TNG50中的任何盘状星系相匹配，包括该领域的物体。我们讨论了对这些发现的可能解释，同时指出了未来对被动星团螺旋的研究，作为进一步测试最先进的宇宙模拟的一种方式。
We study the evolution of kinematically defined stellar discs in 10 Fornax-like clusters identified in the TNG50 run from the IllustrisTNG suite of cosmological simulations. We considered disc galaxies with present-day stellar massM⋆≥ 3 × 108M⊙and follow their evolution since first entering their host cluster. Very few stellar discs survive since falling in such dense environments, ranging from 40 per cent surviving to all being disrupted. Such survival rates are consistent with what reported earlier for the two more massive, Virgo-like clusters in TNG50. In absolute terms, however, the low number of present-day disc galaxies in Fornax-like clusters could be at odds with the presence of three edge-on disc galaxies in the central regions of the actual Fornax cluster, as delineated by the Fornax3D survey. When looking at the Fornax analogues from random directions and with the same selection function of Fornax3D, the probability of finding three edge-on disc galaxies in any one Fornax-like cluster in TNG50 is rather low, albeit not impossible. We also compared the stellar-population properties near the equatorial plane derived from integral-field spectroscopy for the three edge-ons in Fornax to similar line-of-sight integrated values for present-day disc galaxies in TNG50. For one of these, the very old and metal-rich stellar population of its disc cannot be matched by any the disc galaxies in TNG50, including objects in the field. We discuss possible interpretations of these findings, while pointing to future studies on passive cluster spirals as a way to further test state-of-the-art cosmological simulations.