CMB lensing tomography with clustering estimation of lens redshift distributions
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911020819152896 |
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| author | Arai, Shun Peacock, John A. Miyatake, Hironao Nishizawa, Atsushi J. |
| author_facet | Arai, Shun Peacock, John A. Miyatake, Hironao Nishizawa, Atsushi J. |
| contents | We develop a clustering-based redshift estimation approach for CMB lensing tomography, focusing on the kernel function of the lensing galaxies. Within a linear galaxy bias framework, we derive estimators for this kernel from two-point cross-correlations between lens mass and reference samples. The reconstructed kernel then enables a theoretical prediction for the angular cross-power spectrum \(C_{gκ}\) between CMB lensing convergence and lens galaxies. As a proof of concept, we measure \(C_{gκ}\) by correlating the \emph{Planck} PR4 convergence map with NVSS+SUMSS radio galaxies (\(0\lesssim z\lesssim 3\)). We estimate the radio-galaxy kernel by collectively cross-correlating their distribution with spectroscopic and photometric surveys (2MPZ, LOWZ-CMASS, eBOSS DR16 LRGs, and Gaia-unWISE QSOs). From the measured \(C_{gκ}\), we obtain \(σ_8 = 0.86^{+0.12}_{-0.09}\) when the density parameter is set to the {\it Planck} value of $Ω_m = 0.315$; this is in good agreement with the \emph{Planck} normalisation of $σ_8 = 0.812$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_10168 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | CMB lensing tomography with clustering estimation of lens redshift distributions Arai, Shun Peacock, John A. Miyatake, Hironao Nishizawa, Atsushi J. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We develop a clustering-based redshift estimation approach for CMB lensing tomography, focusing on the kernel function of the lensing galaxies. Within a linear galaxy bias framework, we derive estimators for this kernel from two-point cross-correlations between lens mass and reference samples. The reconstructed kernel then enables a theoretical prediction for the angular cross-power spectrum \(C_{gκ}\) between CMB lensing convergence and lens galaxies. As a proof of concept, we measure \(C_{gκ}\) by correlating the \emph{Planck} PR4 convergence map with NVSS+SUMSS radio galaxies (\(0\lesssim z\lesssim 3\)). We estimate the radio-galaxy kernel by collectively cross-correlating their distribution with spectroscopic and photometric surveys (2MPZ, LOWZ-CMASS, eBOSS DR16 LRGs, and Gaia-unWISE QSOs). From the measured \(C_{gκ}\), we obtain \(σ_8 = 0.86^{+0.12}_{-0.09}\) when the density parameter is set to the {\it Planck} value of $Ω_m = 0.315$; this is in good agreement with the \emph{Planck} normalisation of $σ_8 = 0.812$. |
| title | CMB lensing tomography with clustering estimation of lens redshift distributions |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.10168 |