Pairwise Transverse Velocity Measurement with the Rees–Sciama Effect
Pairwise Transverse Velocity Measurement with the Rees–Sciama Effect
复制标题
利用里斯-夏玛效应进行成对横向速度测量
DOI：
--
复制
发表时间：
2018
影响因子：
4.9
通讯作者：
E. Pierpaoli
中科院分区：
文献类型：
--
作者：
S. Yasini;Nareg Mirzatuny;E. Pierpaoli
我们引入了一种新的星系团平均成对速度估计器，该估计器基于星系团横向速度分量的测量。里斯-夏马 (RS) 效应通过其在宇宙微波背景 (CMB) 温度图中晕中心周围的独特偶极特征提供了测量横向奇速度的机会。我们利用这种偶极结构从 CMB 地图中提取横向速度矢量的大小和方向，该地图使用 CMB-S4 等未来勘测的预期特征进行模拟。尽管在存在透镜 CMB 和仪器噪声的情况下，单个速度无法可靠地重建，但我们证明，使用估计器获得的平均成对速度测量结果，在 z = 0.5 的 40 × 40 [deg2] 斑块中，对于 M > 7 × 1013 M⊙ 的 ∼21,000 个光晕，产生的信噪比为 5.2。虽然所提出的估计器在 CMB IV 阶段实验中通过 RS 效应测量成对速度具有广阔的前景，但其应用范围可扩展到任何其他潜在的横向速度探测。
We introduce a new estimator for the mean pairwise velocities of galaxy clusters, which is based on the measurement of the clusters’ transverse velocity components. The Rees–Sciama (RS) effect offers an opportunity to measure transverse peculiar velocities through its distinct dipolar signature around the halo centers in the cosmic microwave background (CMB) temperature map. We exploit this dipolar structure to extract the magnitude and direction of the transverse velocity vectors from CMB maps simulated with the expected characteristics of future surveys like CMB-S4. Although in the presence of lensed CMB and instrumental noise individual velocities are not reliably reconstructed, we demonstrate that the mean pairwise velocity measurement obtained using the estimator yields a signal-to-noise ratio of 5.2 for ∼21,000 halos with M > 7 × 1013 M⊙ in a 40 × 40 [deg2] patch at z = 0.5. While the proposed estimator carries promising prospects for measuring pairwise velocities through the RS effect in CMB stage IV experiments, its applications extend to any other potential probe of transverse velocities.
影响因子：
6.4
作者：
F. Bernardis;S. Aiola;E. Vavagiakis;N. Battaglia;M. Niemack;J. Beall;D. Becker;J. Bond;E. Calabrese;H. Cho;K. Coughlin;R. Datta;M. Devlin;J. Dunkley;R. Dunner;S. Ferraro;A. Fox;P. Gallardo;M. Halpern;N. Hand;M. Hasselfield;S. Henderson;J. Hill;G. Hilton;M. Hilton;A. Hincks;R. Hložek;J. Hubmayr;K. Huffenberger;J. Hughes;K. Irwin;B. Koopman;A. Kosowsky;D. Li;T. Louis;M. Lungu;M. Madhavacheril;L. Maurin;J. McMahon;K. Moodley;S. Naess;F. Nati;L. Newburgh;J. Nibarger;L. Page;B. Partridge;E. Schaan;B. Schmitt;N. Sehgal;J. Sievers;S. Simon;D. Spergel;S. Staggs;J. Stevens;R. Thornton;A. V. Engelen;J. Lanen;Edward J. Wollack
通讯作者：
F. Bernardis;S. Aiola;E. Vavagiakis;N. Battaglia;M. Niemack;J. Beall;D. Becker;J. Bond;E. Calabrese;H. Cho;K. Coughlin;R. Datta;M. Devlin;J. Dunkley;R. Dunner;S. Ferraro;A. Fox;P. Gallardo;M. Halpern;N. Hand;M. Hasselfield;S. Henderson;J. Hill;G. Hilton;M. Hilton;A. Hincks;R. Hložek;J. Hubmayr;K. Huffenberger;J. Hughes;K. Irwin;B. Koopman;A. Kosowsky;D. Li;T. Louis;M. Lungu;M. Madhavacheril;L. Maurin;J. McMahon;K. Moodley;S. Naess;F. Nati;L. Newburgh;J. Nibarger;L. Page;B. Partridge;E. Schaan;B. Schmitt;N. Sehgal;J. Sievers;S. Simon;D. Spergel;S. Staggs;J. Stevens;R. Thornton;A. V. Engelen;J. Lanen;Edward J. Wollack