Reconstructing the gravitational lensing potential from the Lyman-α forest

被引：3

作者：

Metcalf, R. Benton ^{[1
,2
]}

Tessore, Nicolas ^{[3
]}

Croft, Rupert A. C. ^{[4
]}

机构：

[1] Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy

[2] INAF Osservatorio Astron Bologna, Via Ranzani 1, I-40127 Bologna, Italy

[3] Univ Manchester, Jodrell Bank Ctr Astrophys, Alan Turing Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England

[4] Carnegie Mellon Univ, McWilliams Ctr Cosmol, Dept Phys, Pittsburgh, PA 15213 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 642卷

关键词：

cosmology: miscellaneous; gravitational lensing: weak; methods: observational; 21-CM INTENSITY MAPS; COUNTS-IN-CELLS; COSMOLOGICAL GEOMETRY; POWER SPECTRUM; DARK-MATTER; FLUCTUATIONS; IMPACT; SUITE;

D O I：

10.1051/0004-6361/202038056

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We demonstrate a method for reconstructing the weak lensing potential from the Lyman-alpha forest data. We derive an optimal estimator for the lensing potential on the sky based on the correlation between pixels in real space. This method effectively deals with irregularly spaced data, holes in the survey, missing data, and inhomogeneous noise. We demonstrate an implementation of the method with simulated spectra and weak lensing. It is shown that with a source density of greater than or similar to 0.5 per square arcmin and similar to 200 pixels in each spectrum (lambda/Delta lambda =1300) the lensing potential can be reconstructed with high fidelity if the relative absorption in the spectral pixels is signal dominated. When noise dominates the measurement of the absorption in each pixel the noise in the lensing potential is higher, but for reasonable numbers of sources and noise levels and a high fidelity map the lensing potential is obtainable. The lensing estimator could also be applied to lensing of the cosmic microwave background, 21 cm intensity mapping, or any case in which the correlation function of the source can be accurately estimated.

引用

页数：16

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