论文标题
横盘中的棒形成：λCDM的挑战
Bar formation in submaximal discs: a challenge for ΛCDM
论文作者
论文摘要
银河形成的宇宙学模拟中的棒形成仍然具有挑战性。以前显示，与观察相比，TNG50中TNG50中低恒星质量的禁止星系的比例太低。在这里，我们强调了另一种紧张局势，在较高的恒星质量上也观察到，即在TNG50中禁止的星系似乎是最大的光盘，因为在重力加速度的大多数是由Baryons占重力加速度的，而在重载旋转策略的峰值半径上，观测值却占据了符号符号的盘子。在这封信中，我们比较了从SPARC目录中的本地宇宙中次最大光盘的禁止的部分，而TNG50模拟中的二张光盘则比较了。我们表明，尽管SPARC倾向于反对禁止的星系，但该数据集中禁止的次最大光盘的比例明显大于TNG50中。该结果增加了与预测星系形成的$λ$ CDM模拟中禁止星系的正确统计和特性有关的挑战列表。
Bar formation in cosmological simulations of galaxy formation remains challenging. It was previously shown that the fraction of barred galaxies at low stellar masses ($M_*<10^{10.5} M_\odot$) in TNG50 is too low compared to observations. Here, we highlight another tension, also observed at higher stellar masses, namely that barred galaxies in TNG50 appear to be maximal discs, in the sense that the majority of the gravitational acceleration is accounted for by baryons at the peak radius of the baryonic rotation curve, while observations account for a substantial fraction of barred submaximal discs. In this letter, we compare the barred fraction of submaximal discs in the local Universe from the SPARC catalogue with that in the TNG50 simulation. We show that, although SPARC tends to select against barred galaxies, the fraction of barred submaximal discs in this dataset is significantly larger than in TNG50. This result adds to the list of challenges related to predicting the right statistics and properties of barred galaxies in $Λ$CDM simulations of galaxy formation.
