论文标题
重建具有运动量Sunyaev-Zeldovich效应的宇宙空隙的径向速度曲线
Reconstructing the radial velocity profile of cosmic voids with kinematic Sunyaev-Zeldovich Effect
论文作者
论文摘要
我们开发了一个估计器，以通过运动对周围星系对的运动学Sunyaev-Zeldovich效应来提取宇宙空隙的平均径向速度曲线。使用同一模拟的模拟纯ksz映射和无效目录数据测试估计器。结果表明，恢复的信号可以通过地图的低角度分辨率或大孔径光度法半径大小来减弱，但是平均径向速度曲线可以通过我们的估计器充分恢复。通过将估计器应用于Planck 2D-ILC CMB图，带有银河系和Boss DR12的空隙目录，我们发现估计的void速度曲线为$3.31σ$，除了对持续上升的密度均值渐近均匀密度至平均密度的空隙的无效检测。对于带有正密度对比度壳的空隙的空隙，$1.75σ$包围。通过将重建的数据拟合到理论配置文件中，我们发现减少的$χ^{2} $分别为$ 1.19 $和$ 0.62 $，分别为两种void，这表明该模型非常适合数据。然后，我们预测了宇宙空隙的径向速度曲线的可检测性，其中包括未来的CMB调查，包括SPT-3G，Advact和Simons天文台。我们发现，CMB残差的污染效果可以忽略不计2,000美元〜{\ rm deg}^2 $，尤其是孔径光度法大小小于$ 1 \，{\ rm arcmin} $。但是仪器噪声的影响不可忽略。对于未来的SPT-3G，Advact和Simons天文台，根据特定的仪器参数，检测可能从3σ$到10σ$ c.l. $可实现。这为探测宇宙结构的动力学开辟了一个新的窗口。
We develop an estimator to extract the mean radial velocity profile of cosmic voids via the kinematic Sunyaev-Zeldovich effect of pairs of galaxies surrounding them. The estimator is tested with simulated pure kSZ map and void catalogue data from the same simulation. The results show that the recovered signal could be attenuated by low angular resolution of the map or large aperture photometry filter radius size, but the mean radial velocity profile can be fully recovered with our estimator. By applying the estimator to the Planck 2D-ILC CMB map, with galaxy and void catalogues from BOSS DR12, we find that the estimated void velocity profile is $3.31σ$ apart from null detection for for voids with continuously rising density profiles asymptoting to the mean density; and $1.75σ$ for voids with positive density contrast shell surrounded. By fitting the reconstructed data to the theoretical profile, we find the reduced $χ^{2}$ to be $1.19$ and $0.62$ for the two types of void, respectively, indicating a good fit of the model to the data. We then forecast the detectability of the radial velocity profile of cosmic voids with future CMB surveys, including SPT-3G, AdvACT, and Simons Observatory. We find that the contamination effect from CMB residuals is negligible with survey area over $2,000~{\rm deg}^2$, especially with aperture photometry size less than $1\,{\rm arcmin}$. But the effect from instrumental noise is non-negligible. For future SPT-3G, AdvACT and Simons Observatory, the detection is potentially achievable from $3σ$ to $10σ$ C.L., depending on specific instrumental parameters. This opens a new window of probing dynamics of the cosmic structures from the kinematic Sunyaev-Zeldovich effect.
