论文标题

使用LSST微透镜来限制球形和磁盘配置中的深色紧凑对象

Using LSST Microlensing to Constrain Dark Compact Objects in Spherical and Disk Configurations

论文作者

Winch, Harrison, Setford, Jack, Bovy, Jo, Curtin, David

论文摘要

带有Vera Rubin天文台的时空和时间(LSST)的传统调查将对我们的银河系中的深色紧凑物体(DCO)提供强大的微透镜约束。但是,大多数当前的预测将其分析限制为原始黑洞(PBH)。目前尚不清楚LSST微透镜如何能够在亚偏二元DM分数下以不同的银河空间曲线分布来约束DCO的替代模型。在这项工作中,我们研究了LSST微透明如何限制DCO的球形或类似磁盘样的银河系空间分布,并考虑到长时间的观察时间,Baryonic微透镜背景以及LSST源的天空分布。这些扩展代表了对现有微透析预测的显着改进,从精度和多功能性方面。我们通过在球形和类似磁盘的分布中推导针对DCO的新LSST灵敏度预测来证明这种功能。我们预测,LSST将能够约束一个太阳能PBH,其DM分数低于$ 4.1 \ times10^{ - 4} $。与银河磁盘相同尺寸的黑盘分布中的一极质量对象将被限制在$ 3.1 \ times10^{ - 4} $以下,而$ M = 10^5M _ {\ odot} $的单极磁盘将被约束至$ 3.4 \ times10^{ - 5} $。我们发现,压缩的黑盘可以比与重型磁盘相同的尺寸优于$ \ sim10 $限制为$ \ sim10 $。我们还发现,当黑暗磁盘相对于我们自己的磁盘倾斜时,它们会变得不太严格。该预测软件是一种多功能工具,能够用微透明以银河系的方式约束任何DCO模型,并在{https://github.com/harrisonwinch96/darkdisk_micrololensing}上公开提供。

The Legacy Survey of Space and Time (LSST) with the Vera Rubin Observatory will provide strong microlensing constraints on dark compact objects (DCOs) in our Galaxy. However, most current forecasts limit their analysis to Primordial Black Holes (PBH). It is unclear how well LSST microlensing will be able to constrain alternative models of DCOs with different Galactic spatial profile distributions at a subdominant DM fraction. In this work, we investigate how well LSST microlensing will constrain spherical or disk-like Galactic spatial distributions of DCOs, taking into account extended observing times, baryonic microlensing background, and sky distribution of LSST sources. These extensions represent significant improvements over existing microlensing forecasts in terms of both accuracy and versatility. We demonstrate this power by deriving new LSST sensitivity projections for DCOs in spherical and disk-like distributions. We forecast that LSST will be able to constrain one solar mass PBHs to have a DM fraction under $4.1\times10^{-4}$. One-solar-mass objects in a dark disk distribution with the same dimensions as the Galactic disk will be constrained below $3.1\times10^{-4}$, while those with $m = 10^5M_{\odot}$ will be constrained to below $3.4\times10^{-5}$. We find that compressed dark disks can be constrained up to a factor of $\sim10$ better than ones with identical dimensions to the baryonic disk. We also find that dark disks become less tightly constrained when they are tilted with respect to our own disk. This forecasting software is a versatile tool, capable of constraining any model of DCOs in the Milky Way with microlensing, and is made publically available at {https://github.com/HarrisonWinch96/DarkDisk_Microlensing}.

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