arXiv 2102.054842021-02-10astro-ph.GA

矮星系自转曲线多样性的系统效应

Systematic effects on the diversity of dwarf galaxies rotation curves

J. M. Pacheco-Arias, C. R. Carvajal-Bohorquez, Juan C. B. Pineda, L. A. Núñez

备注：: 4 pages, 2 figures, conference

摘要：

结构形成的宇宙学模拟对于研究宇宙的演化和星系的发展是非常宝贵的，在宇宙学范式$Λ$ CDM的背景下成功地再现了许多观测结果。然而，与引起争论的意见存在显著差异。最近报道的一个是在本地宇宙的矮星系的旋转曲线的形状的多样性，这是在宇宙学流体动力学模拟的旋转曲线的明显的同质性。之前对类似问题的研究表明，有时可以通过在比较中考虑观察效应的影响来缓解这种情况。出于这个原因，在这项工作中，我们提出了一组控制实验来测量的影响，一些系统的影响，与建模的观察过程中，以现实的方式，对合成旋转曲线的多样性。我们的研究结果表明，如光谱功率，空间分辨率和倾角的因素，可以自然地引起显着的波动的形状的旋转曲线，再现高达$47\%$的多样性报告中的观测。这是值得注意的，特别是考虑到我们将样本限制为孤立模拟的高度对称磁盘。这表明，一个更真实的合成旋转曲线模型可能会缓解模拟和观测之间的紧张关系，而不会对冷暗物质的标准宇宙学模型构成挑战。

英文摘要：

Cosmological simulations of structure formation are invaluable to study the evolution of the Universe and the development of galaxies in it successfully reproducing many observations in the context of the cosmological paradigm $Λ$CDM. However, there are remarkable discrepancies with observations that are a matter of debate. One of the most recently reported is the diversity of shapes in the rotation curves of dwarf galaxies in the local Universe which is in contrast to the apparent homogeneity of rotation curves in cosmological hydrodynamic simulations. Previous studies on similar problems have shown that sometimes can be alleviated by accounting for the impact of observational effects in the comparison. For this reason, in this work we present a set of controlled experiments to measure the impact that some systematic effects, associated with modeling the observation process in a realistic way, have on the diversity of synthetic rotation curves. Our results demonstrate that factors such as spectral power, spatial resolution and inclination angle, can naturally induce noticeable fluctuations on the shape of the rotation curves, reproducing up to $47\%$ of the diversity reported in the observations. This is remarkable, especially considering that we limited the sample to highly-symmetric disks simulated in isolation. This shows that a more realistic modeling of synthetic rotation curves may alleviate the reported tension between simulations and observations, without posing a challenge to the standard cosmological model of cold dark matter.

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