Improving Cosmological Constraints from Galaxy Cluster Number Counts with CMB-cluster-lensing Data: Results from the SPT-SZ Survey and Forecasts for the Future

Chaubal, P.; Reichardt, Christian; Gupta, N.; Ansarinejad, Behzad; Aylor, K.; Balkenhol, L.; Baxter, Eric J.; Bianchini, F.; Benson, B. A.; Bleem, Lindsey; Bocquet, S.; Carlstrom, J. E.; Chang, C. L.; Crawford, T. M.; Crites, A. T.; Haan, T. de; Dobbs, M.; Everett, W.; Floyd, Benjamin; George, E. M.; Halverson, N. W.; Holzapfel, W. L.; Hrubes, J. D.; Knox, L.; Lee, A. T.; Luong-Van, D.; McMahon, Jeff; Meyer, S. S.; Mocanu, L. M.; Mohr, J. J.; Natoli, T.; Padin, S.; Pryke, C.; Ruhl, J. E.; Ruppin, F.; Salvati, L.; Saro, A.; Schaffer, K. K.; Shirokoff, E.; Staniszewski, Z.; Stark, A. A.; Vieira, J. D.; Williamson, A. R.

doi:10.3847/1538-4357/ac6a55

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…Galaxy clusters are the largest gravitationally bound structures in the Universe. Their abundance as a function of redshift and mass is a direct probe of the growth of structures, and thus provides constraints on the matter density Ω m , on the amplitude of matter fluctuations σ 8 , as well as on the dark energy equation of state and the sum of neutrino masses [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Cluster profiles from beyond-the-QE CMB lensing mass maps

Saha,

Legrand,

Carron

2024

J. Cosmol. Astropart. Phys.

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Clusters of galaxies, being the largest collapsed structures in the universe, offer valuable insights into the nature of cosmic evolution. Precise calibration of the mass of clusters can be obtained by extracting their gravitational lensing signal on the Cosmic Microwave Background (CMB) fluctuations. We extend and test here the performance achieved on cluster scales by the parameter-free, maximum a posteriori (MAP) CMB lensing reconstruction method, which has been shown to be optimal in the broader context of CMB lensing mass map and power spectrum estimation. In the context of cluster lensing, the lensing signal of other large-scale structures acts as an additional source of noise. We show here that by delensing the CMB fluctuations around each and every cluster, this noise variance is reduced according to expectations. We also demonstrate that the well-known bias in the temperature quadratic estimator in this regime, sourced by the strong non-Gaussianity of the signal, is almost entirely mitigated without any scale cuts. Being statistically speaking an optimal and blind lensing mass map reconstruction, the MAP estimator is a promising tool for the calibration of the masses of clusters.

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Section: Introductionmentioning

confidence: 99%

Cluster profiles from beyond-the-QE CMB lensing mass maps

Saha,

Legrand,

Carron

2024

J. Cosmol. Astropart. Phys.

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The non-thermal secondary CMB anisotropies from a cosmic distribution of radio galaxy lobes

Acharya

Majumdar

Nath

2022

Monthly Notices of the Royal Astronomical Society

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Current and upcoming high angular resolution and multi-frequency experiments are well poised to explore the rich landscape of secondary CMB anisotropies. In this context, we compute for the first time, the power spectrum of CMB fluctuations from a cosmological distribution of evolving lobes of giant radio galaxies. We, also, explicitly take into account the non-thermal electron distribution, which has important implications for the inference of the CMB angular power spectrum. We calculate the mean global non-thermal y-distortion, 〈y〉NT . For observationally reasonable distribution of the jet luminosities in the range of 1045 − 1047 ergs−1, we find 〈y〉NT to be less than 10−5, and hence not violating the COBE limit as previously claimed. Using the unique spectral dependence of the non-thermal SZ, we show that a detection of 〈y〉NT can be within reach at the level of ≳ 5σ from a future PIXIE-like experiment provided we understand the foregrounds precisely. The total non-thermal SZ power spectrum, $C^{NT}_\ell$, from the radio lobes peaks at ℓ ∼ 3000 with an amplitude $\sim 1{{\%}}$ of thermal SZ power spectrum from galaxy clusters. A a detection of the $C^{NT}_\ell$, with a PIXIE-like sensitivity experiment, can lead to ∼5σ constraint on the mass dependence of the jet luminosity with the constraint becoming, at least, ten times better for the proposed more ambitious CMB-HD survey. This will, further, lead to the tightest constrain on the central black hole mass -to- host halo mass scaling relations.

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Mitigating the impact of the CIB on galaxy cluster SZ detection with spectrally constrained matched filters

Zubeldia

Chluba

Battye

2023

Monthly Notices of the Royal Astronomical Society

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Galaxy clusters detected through the thermal Sunyaev-Zeldovich (tSZ) effect are a powerful cosmological probe from which constraints on cosmological parameters such as Ωm and σ8 can be derived. The measured cluster tSZ signal can be, however, contaminated by Cosmic Infrared Background (CIB) emission, as the CIB is spatially correlated with the cluster tSZ field. We quantify the extent of this contamination by applying the iterative multi-frequency matched filter (iMMF) cluster-finding method to mock Planck-like data from the Websky simulation. We find a significant bias in the retrieved cluster tSZ observables (signal-to-noise and Compton-y amplitude), at the level of about 0.5 σ per cluster. This CIB-induced bias translates into about 20% fewer detections than expected if all the Planck HFI channels are used in the analysis, which can potentially bias derived cosmological constraints. We introduce a spectrally constrained iMMF, or sciMMF, which proves to be highly effective at suppressing this CIB-induced bias from the tSZ cluster observables by removing the cluster-correlated CIB at the expense of a small signal-to-noise penalty. Our sciMMF is also robust to modelling uncertainties, namely to errors in the assumed spectral energy distribution of the cluster-correlated CIB. With it, CIB-free cluster catalogues can be constructed and used for cosmological inference. We provide a publicly available implementation of our sciMMF as part of the SZiFi package.

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Improving Cosmological Constraints from Galaxy Cluster Number Counts with CMB-cluster-lensing Data: Results from the SPT-SZ Survey and Forecasts for the Future

Cited by 5 publications

References 53 publications

Cluster profiles from beyond-the-QE CMB lensing mass maps

Cluster profiles from beyond-the-QE CMB lensing mass maps

The non-thermal secondary CMB anisotropies from a cosmic distribution of radio galaxy lobes

Mitigating the impact of the CIB on galaxy cluster SZ detection with spectrally constrained matched filters

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