Effects of self-calibration of intrinsic alignment on cosmological parameter constraints from future cosmic shear surveys

Yao, Ji; Ishak, Mustapha; Lin, Weikang; Troxel, M. A.

doi:10.1088/1475-7516/2017/10/056

Cited by 29 publications

(27 citation statements)

References 79 publications

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“…We do not consider marginalizing over photometric-redsift systematic parameters, or the impact of intrinsic alignment; see Refs. [77][78][79][80][81] for discussions on impact of intrinsic alignment. So the estimated constraints for LSST cosmic shear are based on an ideal situation.…”

Section: Forecasting the Level Of Tension Between Planck And Lssmentioning

confidence: 99%

Cosmological discordances. II. Hubble constant, Planck and large-scale-structure data sets

Lin

Ishak

2017

Phys. Rev. D

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We examine systematically the (in)consistency between cosmological constraints as obtained from various current data sets of the expansion history, large-scale structure (LSS), and cosmic microwave background (CMB) temperature and polarization from Planck. We run (dis)concordance tests within each set and across the three sets using a recently introduced index of inconsistency (IOI) capable of dissecting inconsistencies between two or more data sets. First, we compare the constraints on H0 from five different methods and find that the IOI drops from 2.85 to 0.88 (on Jeffreys's scales) when the local H0 measurements is removed. This seems to indicate that the local measurement is an outlier compared to the others, thus favoring a systematics-based explanation. We find a moderate inconsistency (IOI=2.61) between Planck temperature and polarization data sets. We find that current LSS data sets including the WiggleZ power spectrum, SDSS redshift space distortion, CFHTLenS weak lensing, CMB lensing, and cluster count from SZ effect, are consistent one with another and also when all combined. However, we find a persistent moderate inconsistency between Planck and individual or combined LSS probes. For Planck TT+lowTEB versus individual LSS probes, the IOI spans the range 2.92-3.72 and increases to 3.44-4.20 when the polarization data is added in. The joint LSS versus the combined Planck temperature and polarization has an IOI of 2.83 in the most conservative case. But if Planck low-temperature and polarization is also added to the joint LSS to constrain τ and break degeneracies, the inconsistency between Planck and joint LSS data increases to the high end of the moderate range with IOI=4.81. Whether due to systematic effects in the data or to the underlying model, these inconsistencies need to be resolved. Finally, we perform forecast calculations using the Large Sky Synoptic Survey (LSST) and find that the discordance between Planck and future LSS data, if it persists as present, can rise up to a high IOI of 17, thus falling in the strong range of inconsistency.

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Section: Forecasting the Level Of Tension Between Planck And Lssmentioning

confidence: 99%

Cosmological discordances. II. Hubble constant, Planck and large-scale-structure data sets

Lin

Ishak

2017

Phys. Rev. D

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“…It is noted that not only these information, but also their uncertainties, namely, errors on errors, are important in tomographic WL studies. Their effects on tomographic 2PCF analyses and the corresponding error propagation to cosmological studies have been investigated extensively (Ma et al 2006;Huterer et al 2006;Ma & Bernstein 2008;Amara & Réfrégier 2008;Sun et al 2009;Bernstein & Huterer 2010;Hearin et al 2010Hearin et al , 2012Yao et al 2017). For WL peak studies, some of the photo-z effects are explored using numerical simulations (Petri et al 2016;Abruzzo & Haiman 2018).…”

Section: Impact Of Photometric Redshift Accuracy On Tomographic Peak ...mentioning

confidence: 99%

“…Therefore for tomographic WL analyses, to assess the impacts of photo-z errors on the derived cosmological constraints is crucially important. From these studies, we can also set requirements for the accuracy of photo-z estimates and the subsequent calibrations (Ma et al 2006;Huterer et al 2006;Ma & Bernstein 2008;Amara & Réfrégier 2008;Sun et al 2009;Bernstein & Huterer 2010;Hearin et al 2010Hearin et al , 2012Yao et al 2017;Cao et al 2018). While the impacts of the photo-z errors on the tomographic 2PCF have been systematically studied in depth (Ma & Bernstein 2008;Mandelbaum et al 2008;Hemmati et al 2018), similar analyses for WL peak statistics are still lacking.…”

Section: Introductionmentioning

confidence: 99%

Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors

Yuan

Pan

Liu³

et al. 2019

ApJ

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Weak lensing peak abundance analyses have been applied in different surveys and demonstrated to be a powerful statistics in extracting cosmological information complementary to cosmic shear two-point correlation studies. Future large surveys with high number densities of galaxies enable tomographic peak analyses. Focusing on high peaks, we investigate quantitatively how the tomographic redshift binning can enhance the cosmological gains. We also perform detailed studies about the degradation of cosmological information due to photometric redshift (photo-z) errors. We show that for surveys with the number density of galaxies ∼ 40 arcmin −2 , the median redshift ∼ 1, and the survey area of ∼ 15000 deg 2 , the 4-bin tomographic peak analyses can reduce the error contours of (Ω m , σ 8 ) by a factor of 5 comparing to 2-D peak analyses in the ideal case of photo-z error being absent. More redshift bins can hardly lead to significantly better constraints. The photo-z error model here is parametrized by z bias and σ ph and the fiducial values of z bias = 0.003 and σ ph = 0.02 is taken. We find that using tomographic peak analyses can constrain the photo-z errors simultaneously with cosmological parameters. For 4-bin analyses, we can obtain σ(z bias )/z bias ∼ 10% and σ(σ ph )/σ ph ∼ 5% without assuming priors on them. Accordingly, the cosmological constraints on Ω m and σ 8 degrade by a factor of ∼ 2.2 and ∼ 1.8, respectively, with respect to zero uncertainties on photo-z parameters. We find that the uncertainty of z bias plays more significant roles in degrading the cosmological constraints than that of σ ph .

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“…where (a, b, r * ) = (1, 4, c/H 0 ) and r is the comoving distance (Kaiser 1992;Hu 1999). The normalization factor N 0 is chosen to satisfy ∫ dN dr dr = 40 galaxies arcmin −2 , corresponding to several important survey projects in the future like LSST, WFIRST and Euclid (Yao et al 2017). Then the expected number of strongly lensed galaxies in redshift range (z s , z s + δz s ) will be…”

Section: Methodsmentioning

confidence: 99%

Strong lensing as a giant telescope to localize the host galaxy of gravitational wave event

Zhang

Wang

2020

Monthly Notices of the Royal Astronomical Society

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Abstract Standard siren cosmology of gravitational wave (GW) merger events relies on the identification of host galaxies and their redshifts. But this can be highly challenging due to numerous candidates of galaxies in the GW localization area. We point out that the number of candidates can be reduced by orders of magnitude for strongly lensed GW events, due to extra observational constraints. For the next-generation GW detectors like Einstein Telescope (ET), we estimate that this number is usually significantly less than one, as long as the GW localization uncertainty is better than $\sim 10\, \rm deg^2$. This implies that the unique identification of the host galaxy of lensed GW event detected by ET and Cosmic Explorer (CE) is possible. This provides us a promising opportunity to measure the redshift of the GW event and facilitate the standard siren cosmology. We also discuss its potential applications in understanding the evolution process and environment of the GW event.

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Effects of self-calibration of intrinsic alignment on cosmological parameter constraints from future cosmic shear surveys

Cited by 29 publications

References 79 publications

Cosmological discordances. II. Hubble constant, Planck and large-scale-structure data sets

Cosmological discordances. II. Hubble constant, Planck and large-scale-structure data sets

Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors

Strong lensing as a giant telescope to localize the host galaxy of gravitational wave event

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