论文标题
不寻常的银河系清单纸系统：对旋转强度和对齐的影响
The Unusual Milky Way-Local Sheet System: Implications for Spin Strength and Alignment
论文作者
论文摘要
银河系和本地表构成了一个奇特的星系系统，从我们附近的速度分散率异常低，以及在这种环境中看似高的银河系。使用TNG300模拟，我们在宇宙壁中搜索了银河系类似物（MWA），其局部哈勃流量的速度分散，类似于我们银河系周围观察到的。我们发现本地单层类似物中的MWA很少见，其中一个（160-200 mpc）^3卷。我们发现，薄片状的冷环境可以保留，放大或简化对星系角动量的环境影响。在这样的床单中，纸和星系旋转之间存在特别强烈的对准。同样，这些星系具有低自旋参数。这两者都可能与自壁形成以来缺乏合并有关。我们希望我们的结果能使对银河系范围内纸系统非典型性质的认识。在不完全考虑我们的宇宙环境的影响的情况下，错误地推断了当地观察，这可能会导致哥白尼偏见在理解银河系和附近宇宙的形成和演变方面。
The Milky Way and the Local Sheet form a peculiar galaxy system in terms of the unusually low velocity dispersion in our neighbourhood and the seemingly high mass of the Milky Way for such an environment. Using the TNG300 simulation we searched for Milky Way analogues (MWA) located in cosmological walls with velocity dispersion in their local Hubble flow similar to the one observed around our galaxy. We find that MWAs in Local-Sheet analogues are rare, with one per (160-200 Mpc)^3 volume. We find that a Sheet-like cold environment preserves, amplifies, or simplifies environmental effects on the angular momentum of galaxies. In such sheets, there are particularly strong alignments between the sheet and galaxy spins; also, these galaxies have low spin parameters. These both may relate to a lack of mergers since wall formation. We hope our results will bring awareness of the atypical nature of the Milky Way-Local Sheet system. Wrongly extrapolating local observations without a full consideration of the effect of our cosmic environment can lead to a Copernican bias in understanding the formation and evolution of the Milky Way and the nearby Universe.
