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.

银河系的盖亚地图在银河系中心的两侧几乎对称的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，假设它们是银河系晕暗物质分布中焦散环的表现形式。一系列这样的环的存在是由焦散环模型预测的。该模型的相空间分布是通过轴子或轴子状粒子的再热玻色-爱因斯坦凝聚物获得的。我们表明，冷轴子流会在重力上夹带尘埃，并提出这是对三角形特征锐度的解释。这些特征的位置意味着我们在地球上比基于前盖亚观测所认为的更接近第五个焦散环。我们很可能在它的三尖瓣横截面内。在这种情况下，地球上的暗物质密度由四种冷流主导，称为大、小、上和下。如果我们在三尖瓣横截面之外，地球上的暗物质密度由两个冷流主导，大和小。我们使用 Gaia 地图中的三角形特征和 IRAS 地图中的匹配特征来估计四个局部主导流的速度矢量和密度。