发表机构
Kavli Institute for Astrophysics and Department of Physics, Massachusetts Institute of Technology; Harvard Laboratory for Particle Physics and Cosmology and Department of Physics, Harvard University（麻省理工学院卡弗里天体物理研究所与物理系; 哈佛大学粒子物理与宇宙学实验室与物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出利用水巨脉泽盘的旋转曲线搜索暗物质尖峰，应用于11个盘，发现NGC 1194和NGC 4258支持尖峰，但翘曲消除多数偏好，且尖峰质量上限约为黑洞质量的10%，为暗物质研究提供新窗口。
AI 中文摘要
在暗物质晕内部绝热增长的黑洞预计会形成致密的尖峰，其幂律斜率介于1.5至2.5之间，具体取决于红移和重子活动。对这一预测的直接动力学测试几乎不存在。在此，我们表明水巨脉泽盘提供了一种这样的测试；其脉泽在距黑洞一帕秒内运行，并通过甚长基线干涉测量法逐一绘制，因此每个半径处的封闭质量可以从旋转曲线中读出。我们开发了一种搜索方法，并将其应用于具有公开运动学的十一个巨脉泽盘。与单独的黑洞相比，在NGC 1194和NGC 4258中尖峰更受青睐，并在其他几个盘中适度改善了拟合。允许盘发生翘曲则消除了除NGC 4258和NGC 6264之外的所有偏好。无论盘是否翘曲，任何盘的组合都不允许尖峰质量超过黑洞质量的约百分之十，这一灵敏度已通过模拟注入测试得到验证。利用脉泽加速度绘制翘曲图并探测更暗的内部脉泽（尖峰与倾斜差异最大的地方）可以打破剩余的简并性。巨脉泽盘为研究超大质量黑洞周围的暗物质打开了一扇窗口，而且重要的是，这一窗口使得人口统计成为可能。
英文摘要
A black hole growing adiabatically inside a dark matter halo is expected to develop a dense spike, with a power-law slope between 1.5 and 2.5, depending on redshift and baryonic activity. Direct dynamical tests of this prediction are almost non-existent. Here we show that water megamaser disks offer one; their masers orbit within a parsec of the black hole and are mapped individually with very long baseline interferometry, so the enclosed mass at each radius can be read off the rotation curve. We develop a search method and apply it to eleven megamaser disks with public kinematics. Compared with a black hole alone, a spike is preferred in NGC 1194 and NGC 4258 and moderately improves the fit in several others. Allowing the disks to warp removes this preference in all but NGC 4258 and NGC 6264. No combination of disks, warped or not, allows a spike heavier than about ten per cent of the black hole mass, a sensitivity validated with mock injection tests. Mapping the warps with maser accelerations and detecting fainter inner masers, where a spike and a tilt differ most, can break the remaining degeneracy. Megamaser disks open a window onto dark matter around supermassive black holes, and, importantly, one that enables population statistics.
Comments15 pages, 7 figures, 3 tables
