银河地震学与暗物质局域密度
Galactoseismology and the Local Density of Dark Matter
摘要：
我们模拟银河系的恒星盘的垂直呼吸模式扰动，并研究其对估计当地的暗物质密度，表面密度和垂直力的影响。这些扰动的证据，涉及银河系盘垂直于其中平面的压缩和膨胀，来自SEGUE，RAVE和LAMOST调查。我们表明，它们的存在可能会导致系统误差$10\%$或更大的垂直力$K_z(z)$在$|z|=1.1\,{\rm kpc}$。这些误差转化为$\gtrsim 25\%$在估计局部暗物质密度时的误差。使用不同的单丰度亚群作为示踪剂提供了一条出路：如果盖亚时代所有示踪剂的推论都一致，那么暗物质的测定将是可靠的。来自不同示踪剂的推论的不一致将标志着未扰动模型的崩溃，并可能提供确定扰动性质的方法。
英文摘要：
We model vertical breathing mode perturbations in the Milky Way's stellar disc and study their effects on estimates of the local dark matter density, surface density, and vertical force. Evidence for these perturbations, which involve compression and expansion of the Galactic disc perpendicular to its midplane, come from the SEGUE, RAVE, and LAMOST surveys. We show that their existence may lead to systematic errors of $10\%$ or greater in the vertical force $K_z(z)$ at $|z|=1.1\,{\rm kpc}$. These errors translate to $\gtrsim 25\%$ errors in estimates of the local dark matter density. Using different mono-abundant subpopulations as tracers offers a way out: if the inferences from all tracers in the Gaia era agree, then the dark matter determination will be robust. Disagreement in the inferences from different tracers will signal the breakdown of the unperturbed model and perhaps provide the means for determining the nature of the perturbation.
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