2 MRS密度场和特殊速度场的约束实现：增长率和局部流动
Constrained realizations of 2MRS density and peculiar velocity fields: growth rate and local flow
摘要：
我们在$200 \; h^{-1} \, \mathrm{Mpc}$中生成了密度和特殊速度场的约束实现（CR），从最终发布的2微米全天空红移巡天（2 MRS）$-$到目前为止的全天空红移巡天。的CR相结合的维纳滤波估计在球形傅里叶-贝塞尔空间与随机实现的对数正态分布的密度场和泊松采样的星系位置。该算法进行了测试和校准的一组半解析模拟目录模仿环境的本地组（LG），严格占重建方法的统计和系统误差。通过比较我们的奇特速度CR与Cosmicflows-3星表中观测到的速度，我们将归一化的线性增长率约束为$f σ_8^\mathrm{lin} = 0.367 \pm 0.060$，这与最新的普朗克结果以及其他直接探测在$1.1 σ$水平上是一致的。同时，我们估计了来自$B^\mathrm{ext} = 199 \pm 68 \; \mathrm{km} \, \mathrm{s}^{-1}$的2 MRS重建体积以外的源对$l = 299 \pm 18^\circ$、$b = 8 \pm 19^\circ$的总体流量贡献。用$1 \; h^{-1} \, \mathrm{Mpc}$高斯平滑的LG位置处的总重建速度场是$685 \pm 75 \; \mathrm{km} \, \mathrm{s}^{-1}$朝向$l = 270.6 \pm 6.6^\circ$，$b = 35.5 \pm 7.2^\circ$，与观察到的CMB偶极子很好地一致。在不同半径内的总重建体流与其他测量兼容。在$50 \; h^{-1} \, \mathrm{Mpc}$高斯窗口内，我们发现$274 \pm 50 \; \mathrm{km} \, \mathrm{s}^{-1}$向$l = 287 \pm 9^\circ$，$b = 11 \pm 10^\circ$的大量流动。用于生成CR并获得这些结果的代码（称为CORAS）是公开的。
英文摘要：
We generate constrained realizations (CRs) of the density and peculiar velocity fields within $200 \; h^{-1} \, \mathrm{Mpc}$ from the final release of the Two-Micron All-Sky Redshift Survey (2MRS) $-$ the densest all-sky redshift survey to date. The CRs are generated by combining a Wiener filter estimator in spherical Fourier-Bessel space with random realizations of log-normally distributed density fields and Poisson-sampled galaxy positions. The algorithm is tested and calibrated on a set of semi-analytic mock catalogs mimicking the environment of the Local Group (LG), to rigorously account for the statistical and systematic errors of the reconstruction method. By comparing our peculiar velocity CRs with the observed velocities from the Cosmicflows-3 catalog, we constrain the normalized linear growth rate to $f σ_8^\mathrm{lin} = 0.367 \pm 0.060$, which is consistent at the $1.1 σ$ level with the latest Planck results as well as other direct probes. Simultaneously, we estimate a bulk flow contribution from sources beyond the 2MRS reconstruction volume of $B^\mathrm{ext} = 199 \pm 68 \; \mathrm{km} \, \mathrm{s}^{-1}$ towards $l = 299 \pm 18^\circ$, $b = 8 \pm 19^\circ$. The total reconstructed velocity field at the position of the LG, smoothed with a $1 \; h^{-1} \, \mathrm{Mpc}$ Gaussian, is $685 \pm 75 \; \mathrm{km} \, \mathrm{s}^{-1}$ towards $l = 270.6 \pm 6.6^\circ$, $b = 35.5 \pm 7.2^\circ$, in good agreement with the observed CMB dipole. The total reconstructed bulk flow within different radii is compatible with other measurements. Within a $50 \; h^{-1} \, \mathrm{Mpc}$ Gaussian window we find a bulk flow of $274 \pm 50 \; \mathrm{km} \, \mathrm{s}^{-1}$ towards $l = 287 \pm 9^\circ$, $b = 11 \pm 10^\circ$. The code used to generate the CRs and obtain these results, dubbed CORAS, is made publicly available.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
