Weak Lensing for Precision Cosmology

Mandelbaum, Rachel

doi:10.1146/annurev-astro-081817-051928

Cited by 320 publications

(193 citation statements)

References 272 publications

(257 reference statements)

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“…In addition, cosmological constraints from cluster abundance studies seem to require an even larger X-ray mass bias of ∼ 40 per cent in order to reconcile their results with Planck measurements of the primary CMB (Planck Collaboration XXIV 2016; Salvati et al 2018). Weak lensing is expected to give a less biased estimate of the true mass than the X-ray hydrostatic method because it is relatively insensitive to the equilibrium state of the cluster (see Hoekstra et al 2013 andMandelbaum 2018 for recent reviews). This is generally confirmed by numerical studies, which find significantly smaller biases in weak lensing mass measurements ( 10 per cent; e.g.…”

Section: Comparison To Observationsmentioning

confidence: 99%

The redshift evolution of X-ray and Sunyaev–Zel’dovich scaling relations in the fable simulations

Henden

Puchwein

Sijacki

2019

Monthly Notices of the Royal Astronomical Society

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We study the redshift evolution of the X-ray and Sunyaev-Zel'dovich (SZ) scaling relations for galaxy groups and clusters in the fable suite of cosmological hydrodynamical simulations. Using an expanded sample of 27 high-resolution zoom-in simulations, together with a uniformly-sampled cosmological volume to sample low-mass systems, we find very good agreement with the majority of observational constraints up to z ∼ 1. We predict significant deviations of all examined scaling relations from the simple self-similar expectations. While the slopes are approximately independent of redshift, the normalisations evolve positively with respect to self-similarity, even for commonly-used mass proxies such as the Y X parameter. These deviations are due to a combination of factors, including more effective AGN feedback in lower mass haloes, larger binding energy of gas at a given halo mass at higher redshifts and larger nonthermal pressure support from kinetic motions at higher redshifts. Our results have important implications for cluster cosmology from upcoming SZ surveys such as SPT-3G, ACTpol and CMB-S4, as relatively small changes in the observable-mass scaling relations (within theoretical uncertainties) have a large impact on the predicted number of high-redshift clusters and hence on our ability to constrain cosmology using cluster abundances. In addition, we find that the intrinsic scatter of the relations, which agrees well with most observational constraints, increases at lower redshifts and for lower mass systems. This calls for a more complex parametrization than adopted in current observational studies to be able to accurately account for selection biases.

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Section: Comparison To Observationsmentioning

confidence: 99%

The redshift evolution of X-ray and Sunyaev–Zel’dovich scaling relations in the fable simulations

Henden

Puchwein

Sijacki

2019

Monthly Notices of the Royal Astronomical Society

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“…Because of the small size of the effect compared to the intrinsic random variation in galaxy orientations and ellipticities, weak lensing measurements require a substantial number of source galaxies to achieve small statistical errors. This results in including small and faint galaxies whose systematic errors are challenging to control (Mandelbaum 2018).…”

Section: Introductionmentioning

confidence: 99%

Producing a BOSS CMASS sample with DES imaging

Lee

Huff

Ross

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present a sample of galaxies with the Dark Energy Survey (DES) photometry that replicates the properties of the BOSS CMASS sample. The CMASS galaxy sample has been well characterized by the Sloan Digital Sky Survey (SDSS) collaboration and was used to obtain the most powerful redshift-space galaxy clustering measurements to date. A joint analysis of redshift-space distortions (such as those probed by CMASS from SDSS) and a galaxy-galaxy lensing measurement for an equivalent sample from DES can provide powerful cosmological constraints. Unfortunately, the DES and SDSS-BOSS footprints have only minimal overlap, primarily on the celestial equator near the SDSS Stripe 82 region. Using this overlap, we build a robust Bayesian model to select CMASS-like galaxies in the remainder of the DES footprint. The newly defined DES-CMASS (DMASS) sample consists of 117,293 effective galaxies covering 1, 244 deg 2 . Through various validation tests, we show that the DMASS sample selected by this model matches well with the BOSS CMASS sample, specifically in the South Galactic cap (SGC) region that includes Stripe 82. Combining measurements of the angular correlation function and the clustering-z distribution of DMASS, we constrain the difference in mean galaxy bias and mean redshift between the BOSS CMASS and DMASS samples to be ∆b = 0.010 +0.045 −0.052 and ∆z = 3.46 +5.48 −5.55 × 10 −3 for the SGC portion of CMASS, and ∆b = 0.044 +0.044 −0.043 and ∆z = (3.51 +4.93 −5.91 ) × 10 −3 for the full CMASS sample. These values indicate that the mean bias of galaxies and mean redshift in the DMASS sample is consistent with both CMASS samples within 1σ.

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“…One final potentially important concern is that of weak lensing (WL), the deflection of photons by intervening matter along the line-of-sight in the limit where the deflection only causes small modifications to the photon's path but not visually striking phenomena such as multiple images (see for instance [185][186][187] for reviews). Photons coming from SMBHs at high redshift will inevitably encounter several lenses (or, more precisely, gravitational potentials) along the line-of-sight to us.…”

Section: F Is Weak Lensing An Issue?mentioning

confidence: 99%

Concerns regarding the use of black hole shadows as standard rulers

Vagnozzi¹,

Bambi²,

Visinelli³

2020

Class. Quantum Grav.

135

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Recently, Tsupko et al. have put forward the very interesting proposal to use the shadows of highredshift supermassive black holes (SMBHs) as standard rulers. This would in principle allow us to probe the expansion history within a redshift range which would otherwise be challenging to access. In this note, we critically examine this proposal, and identify a number of important issues which had been previously overlooked. These include difficulties in obtaining reliable SMBH mass estimates and reaching the required angular resolution, and an insufficient knowledge of the accretion dynamics of high-redshift SMBHs. While these issues currently appear to prevent high-redshift SMBH shadows from being used as robust standard rulers, we hope that our flagging them early will help in making this probe theoretically mature by the time it will be experimentally feasible.

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Weak Lensing for Precision Cosmology

Cited by 320 publications

References 272 publications

The redshift evolution of X-ray and Sunyaev–Zel’dovich scaling relations in the fable simulations

The redshift evolution of X-ray and Sunyaev–Zel’dovich scaling relations in the fable simulations

Producing a BOSS CMASS sample with DES imaging

Concerns regarding the use of black hole shadows as standard rulers

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