论文标题
Erosita All-Sky调查
Low-scatter galaxy cluster mass proxies for the eROSITA all-sky survey
论文作者
论文摘要
正在进行的X射线全套调查中使用Erosita仪器进行大型星系群集样品，这将对宇宙参数产生强烈的限制。特别是，该调查有很大的希望，可以调查CMB和低降射测量之间的张力。当前阻止对调查数据完全开发的瓶颈是与可观察到的调查和光晕质量之间关系相关的系统。最近的许多研究表明，气体质量和核心添加的X射线光度在固定质量下表现出非常低的散射。我们提出了一种新的方法，可以从低光子计数数据中重建这些数量，并使用广泛的类似Erosita样模拟来验证该方法。我们发现，即使在〜50的检测阈值附近，也可以以20-30％的精度回收核心口气的发光度和气体质量，这大大低于固定质量处的完整集成X射线光度的散布。当结合对绝对质量量表的准确校准（例如，通过弱重力透镜）结合使用，我们的技术会减少质量校准引起的宇宙学参数的系统。
The on-going X-ray all-sky survey with the eROSITA instrument will yield large galaxy cluster samples, which will bring strong constraints on cosmological parameters. In particular, the survey holds great promise to investigate the tension between CMB and low-redshift measurements. The current bottleneck preventing the full exploitation of the survey data is the systematics associated with the relation between survey observable and halo mass. Numerous recent studies have shown that gas mass and core-excised X-ray luminosity exhibit very low scatter at fixed mass. We propose a new method to reconstruct these quantities from low photon count data and validate the method using extensive eROSITA-like simulations. We find that even near the detection threshold of ~50 counts the core-excised luminosity and the gas mass can be recovered with 20-30% precision, which is substantially less than the scatter of the full integrated X-ray luminosity at fixed mass. When combined with an accurate calibration of the absolute mass scale (e.g. through weak gravitational lensing), our technique reduces the systematics on cosmological parameters induced by the mass calibration.
