论文标题
三角形特征在Gaia Skymap中的含义对银河系的苛性环模型的含义
Implications of triangular features in the Gaia skymap for the Caustic Ring Model of the Milky Way halo
论文作者
论文摘要
银河系的Gaia地图在银河中心相对的几乎对称位置显示了一对三角形特征。在本文中，我们探讨了这些特征的含义，假设它们是银河系光环的暗物质分布中的苛性环的表现。苛性环模型预测了一系列此类环的存在。该模型的相空间分布是通过轴或轴突样颗粒的玻璃体冷凝物获得的。我们表明，灰尘在重力上被冷轴向流动，并提出了这一点，以解释三角形特征的清晰度。特征的位置表明，我们在地球上的位置比基于高气观测的想法要接近第五个苛性环。我们很可能位于其三级横截面内。在这种情况下，地球上的暗物质密度由四个冷流，称为大，小，上下。如果我们不在Tricusp横截面之外，那么地球上的暗物质密度将由两个冷流动，大小很少。我们使用Gaia地图中的三角形特征以及IRAS地图中的匹配功能来估计四个本地主要流动的速度向量和密度。
The Gaia map of the Milky Way reveals a pair of triangular features at nearly symmetric locations on opposite sides of the Galactic Center. In this paper we explore the implications of these features assuming they are manifestations of a caustic ring in the dark matter distribution of the Milky Way halo. The existence of a series of such rings is predicted by the Caustic Ring Model. The model's phase-space distribution is that acquired by a rethermalizing Bose-Einstein condensate of axions or axion-like particles. We show that dust is gravitationally entrained by cold axion flows and propose this as an explanation for the sharpness of the triangular features. The locations of the features imply that we on Earth are much closer to the fifth caustic ring than thought on the basis of pre-Gaia observations. Most likely we are inside its tricusp cross-section. In that case the dark matter density on Earth is dominated by four cold flows, termed Big, Little, Up and Down. If we are outside the tricusp cross-section the dark matter density on Earth is dominated by two cold flows, Big and Little. We use the triangular features in the Gaia map, and a matching feature in the IRAS map, to estimate the velocity vectors and densities of the four locally dominant flows.
