标题： 从最暗弱星系获得的MACHOs的鲁棒界限 显示英文标题

标题： Robust bounds on MACHOs from the faintest galaxies

摘要： 我们利用超微弱矮星系（UFD）中恒星的动力加热来对大质量致密晕天体（MACHOs）设置限制。 在我们的分析中，我们研究了关键UFD参数的不确定性下界限的稳健性，例如半光半径、恒星速度弥散、总晕质量以及暗物质和恒星密度分布。 我们将这个框架应用于已确立的UFD候选者，以及最近发现的UFD候选者大熊座III/UNIONS 1。 我们发现多个UFD在质量范围$10\, M_\odot \lesssim M_{\rm MACHO} \lesssim 10^9\, M_\odot$内产生一致的强限制，强调了仅基于Segue I的先前分析的稳健性。 我们还证明，如果大熊座III被确认为UFD，将显著改善约束条件，在质量范围$1\, M_{\odot}\lesssim M_{\rm MACHO} \lesssim 10^5\, M_\odot$提供对MACHO暗物质最强的约束。 显示英文摘要

摘要： We use the dynamical heating of stars in ultrafaint dwarf (UFD) galaxies to set limits on Massive Compact Halo Objects (MACHOs). In our analysis we study the robustness of the bounds under uncertainties in key UFD parameters, such as the half-light radius, stellar velocity dispersion, total halo mass and dark matter and stellar density profiles. We apply this framework to both well-established UFD candidates, as well as the recently discovered UFD candidate Ursa Major III/UNIONS 1. We find that multiple UFDs yield consistently strong limits in the mass range $10\, M_\odot \lesssim M_{\rm MACHO} \lesssim 10^9\, M_\odot$, underscoring the robustness of a previous analysis solely based on Segue I. We also demonstrate that Ursa Major III, if confirmed as an UFD, would improve the constraints significantly, providing the strongest constraints on MACHO dark matter in the mass range $1\, M_{\odot}\lesssim M_{\rm MACHO} \lesssim 10^5\, M_\odot$.