论文标题
测试宇宙学原理：在不同宇宙学时期类星体全身运动的星体限制
Testing the Cosmological Principle: Astrometric Limits on Systemic Motion of Quasars at Different Cosmological Epochs
论文作者
论文摘要
在Gaia EDR3中，$ 60,410 $ tona fide的光学类星体在天空的椭圆形8400平方英尺区域中的光谱和光谱红移。使用极性坐标的正交Zernike函数，适当的运动场适用于整个样品的加权最小二乘调整，并将六个相等的红移箱相等。具有37个Zernike功能的整体拟合揭示了一种具有统计学意义的模式，这很可能具有工具性。该模式的主要特征是峰链，主要在R.A.中浸入。幅度为25〜 $μ$的组件为yr $^{ - 1} $。从六个类似拟合中的每一个中的每个类星体中的每个拟合中减去了该字段，该拟合覆盖了0.5至7.03，中位值为0.72、1.00、1.25、1.25、1.52、1.83、2.34。由此产生的残差模式更嘈杂，正式不确定性最高为8〜 $μ$，如该区域的中部部分yr $^{ - 1} $。我们检测到R.A.的单个高信心Zernike术语高速公路的正确运动组件约为1.52左右，代表30 $μ$的一般梯度为yr $^{ - 1} $，超过$ 150 \ degr $。我们找不到残留适当运动场的任何中小型或中等规模的全身变化，因为红移的功能高于$ 2.5 \，σ$显着性水平。
A sample of $60,410$ bona fide optical quasars with astrometric proper motions in Gaia EDR3 and spectroscopic redshifts above 0.5 in an oval 8400 square degree area of the sky is constructed. Using orthogonal Zernike functions of polar coordinates, the proper motion fields are fitted in a weighted least-squares adjustment of the entire sample and of six equal bins of sorted redshifts. The overall fit with 37 Zernike functions reveals a statistically significant pattern, which is likely to be of instrumental origin. The main feature of this pattern is a chain of peaks and dips mostly in the R.A. component with an amplitude of 25~$μ$as yr$^{-1}$. This field is subtracted from each of the six analogous fits for quasars grouped by redshifts covering the range 0.5 through 7.03, with median values 0.72, 1.00, 1.25, 1.52, 1.83, 2.34. The resulting residual patterns are noisier, with formal uncertainties up to 8~$μ$as yr$^{-1}$ in the central part of the area. We detect a single high-confidence Zernike term for R.A. proper motion components of quasars with redshifts around 1.52 representing a general gradient of 30 $μ$as yr$^{-1}$ over $150\degr$ on the sky. We do not find any small- or medium-scale systemic variations of the residual proper motion field as functions of redshift above the $2.5\,σ$ significance level.
