论文标题
光环形状测量的灵敏度
Sensitivity of Halo Shape Measurements
论文作者
论文摘要
在宇宙学模拟的分析中，星系和星系簇的形状测量广泛。但是这些测量的局限性已经进行了很少的研究。在本文中，我们解释了为什么形状测量的质量不仅取决于数值分辨率，还取决于密度梯度。特别是，这可能会限制光环中心区域的测量质量。我们提出了一个标准，以根据光环的密度梯度估算测量形状的灵敏度，并将其应用于无碰撞和自我相互作用的暗物质的宇宙学模拟。通过这种情况，我们证明了可靠的光环形状的可靠测量值以及芯密度曲线如何限制其适用性。
Shape measurements of galaxies and galaxy clusters are widespread in the analysis of cosmological simulations. But the limitations of those measurements have been poorly investigated. In this paper, we explain why the quality of the shape measurement does not only depend on the numerical resolution, but also on the density gradient. In particular, this can limit the quality of measurements in the central regions of haloes. We propose a criterion to estimate the sensitivity of the measured shapes based on the density gradient of the halo and to apply it to cosmological simulations of collisionless and self-interacting dark matter. By this, we demonstrate where reliable measurements of the halo shape are possible and how cored density profiles limit their applicability.
