An estimator for the lensing potential from galaxy number counts

被引：36
|
作者：
Nistane, Viraj [1 ,2 ]
Jalilvand, Mona [3 ,4 ,5 ]
Carron, Julien [1 ,2 ]
Durrer, Ruth [1 ,2 ]
Kunz, Martin [1 ,2 ]
机构：
[1] Univ Geneva, Dept Phys Theor, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
[2] Univ Geneva, Ctr Astroparticle Phys, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
[3] McGill Univ, Dept Phys, 3600 Rue Univ, Montreal, PQ H3A 2T8, Canada
[4] McGill Univ, McGill Space Inst, 3550 Rue Univ, Montreal, PQ H3A 2A7, Canada
[5] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2022年 / 06期
基金：
英国医学研究理事会; 欧盟地平线“2020”;
关键词：
gravitational lensing; weak gravitational lensing; redshift surveys; galaxy surveys;
D O I：
10.1088/1475-7516/2022/06/024
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We derive an estimator for the lensing potential from galaxy number counts which contains a linear and a quadratic term. We show that this estimator has a much larger signal-to-noise ratio than the corresponding estimator from intensity mapping. We show that this is due to the additional lensing term in the number count angular power spectrum which is present already at linear order. We estimate the signal-to-noise ratio for future photometric surveys. We find that particularly at high redshifts, z greater than or similar to 1.5, the signal to noise ratio can become of order 30. We therefore claim that number counts in photometric surveys are an excellent means to measure tomographic lensing spectra.
引用
收藏
页数：26
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