Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations

Okumura, Teppei; Taruya, Atsushi; Nishimichi, Takahiro

doi:10.1093/mnras/staa718

Cited by 24 publications

(21 citation statements)

References 73 publications

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“…(16). These contain most of the information [21] and will therefore be the power spectra of interest. They are given by…”

Section: Fisher Forecast and Resultsmentioning

confidence: 99%

“…In this article, the aim is to show that measuring the correlation between shapes of galaxies and the underlying velocity field of the large scale structure is within the reach of upcoming galaxy surveys. To this end, we predict this correlation relying on the linear alignment model as described in [18,20,21]. Our prediction gives significant results for measuring the signal of the velocity-shape correlation in the data and therefore, we also describe two possible applications of the velocity-shape correlation.…”

Section: Introductionmentioning

confidence: 97%

“…5]. Recently, it has been proposed that there also exists a correlation between the shapes of galaxies and the cosmic velocity field [18,20,21]. This correlation could add information on top of the already measured galaxy density-shape correlation because of the relation between velocity v and the dark matter over-density δ , expressed in Fourier space as…”

Section: Introductionmentioning

confidence: 99%

“…It is furthermore expected that the velocityshape correlation signal is enlarged relative to the densityshape signal on large scales because of the k/k 2 term, in which a small wavenumber k indicates large real space distances. Nbody simulations show that this amplification of the signal is indeed present [18,20,21] and the next step would be to determine whether the velocity-shape correlation signal could be measured with real data. In this article, the aim is to show that measuring the correlation between shapes of galaxies and the underlying velocity field of the large scale structure is within the reach of upcoming galaxy surveys.…”

Section: Introductionmentioning

confidence: 99%

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Prospects for detection and application of the alignment of galaxies with the large-scale velocity field

Gemeren

Chisari

2020

Phys. Rev. D

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Studies of intrinsic alignment effects mostly focus on the correlations between shapes of galaxies with each other, or with the underlying density field of the large scale structure of the universe. Lately, the correlation between shapes of galaxies and the large-scale velocity field has been proposed as an additional probe of the large scale structure. We use a Fisher forecast to make a prediction for the detectability of this velocity-shape correlation with a combination of redshifts and shapes from the 4MOST+LSST surveys, and radial velocity reconstruction from the Simons Observatory. The signal-to-noise ratio for the velocity-shape (dipole) correlation is 23, relative to 44 for the galaxy density-shape (monopole) correlation and for a maximum wavenumber of 0.2 Mpc −1. Increasing signal-to-noise for higher values of the maximum wavenumbers (respectively, 56 and 69, for a maximum wavenumber of 1 Mpc −1) indicate potential gains in the nonlinear regime. Encouraged by these predictions, we discuss two possible applications for the velocity-shape correlation. Measuring the velocity-shape correlation could improve the mitigation of selection effects induced by intrinsic alignments on galaxy clustering. We also find that velocity-shape measurements could potentially aid in determining the scale-dependence of intrinsic alignments when multiple shape measurements of the same galaxies are provided.

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“…(16). These contain most of the information [21] and will therefore be the power spectra of interest. They are given by…”

Section: Fisher Forecast and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prospects for detection and application of the alignment of galaxies with the large-scale velocity field

Gemeren

Chisari

2020

Phys. Rev. D

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“…Note that Refs. [30,58] derived the Hankel transform relations between the 3D power spectrum and the 3D correlation function for the IA shear field assuming the linear IA model and linear RSD effect. Compared to this, we have not employed any model for the projected tensor field or the underlying power spectra.…”

Section: Hankel Transformsmentioning

confidence: 99%

Analysis method for 3D power spectrum of projected tensor field with fast estimator and window convolution modelling: an application to intrinsic alignments

Kurita,

Takada

2022

Preprint

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Rank-2 tensor fields of large-scale structure, e.g. a tensor field inferred from shapes of galaxies, open up a window to directly access 2 scalar, 2 vector and 2 tensor modes, where the scalar fields can be measured independently from the standard density field that is traced by distribution of galaxies.Here we develop an estimator of the multipole moments of coordinate-independent power spectra for the three-dimensional tensor field, taking into account the projection of the tensor field onto plane perpendicular to the line-of-sight direction. To do this, we find that a convenient representation of the power spectrum multipoles can be obtained by the use of the associated Legendre polynomials L m L (µ), instead of the standard one L (µ), in the form which allows for the fast Fourier transform estimations under the local plane-parallel (LPP) approximation. The formulation also allows us to obtain the Hankel transforms to connect the two-point statistics in Fourier and configuration space, which are needed to derive theoretical templates of the power spectrum including convolution of a survey window. To validate our estimators, we use the simulation data of the projected tidal field assuming a survey window that mimics the BOSS-like survey footprint. We show that the LPP estimators fairly well recover the multipole moments that are inferred from the global plane-parallel approximation. We find that the survey window causes a more significant change in the multipole moments of projected tensor power spectrum at k 0.1 hMpc −1 from the input power spectrum, than in the density power spectrum. Nevertheless, the theoretical predictions including the survey window effects match the window-convolved multipole moments measured from the simulations. The analysis method presented here paves the way for a cosmological analysis using three-dimensional tensor-type tracers of large-scale structure for current and future surveys.

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Evidence for baryon acoustic oscillations from galaxy–ellipticity correlations

Xu¹,

Jing²,

Zhao³

et al. 2023

Nat Astron

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The baryon acoustic oscillation feature in the clustering of galaxies or quasars provides a ‘standard ruler’ for distance measurements in cosmology. In this work, we report a 2–3σ signal of the baryon acoustic oscillation dip feature in the galaxy density–ellipticity cross-correlation functions using the spectroscopic sample of the Baryon Oscillation Spectroscopic Survey CMASS, combined with the deep Dark Energy Spectroscopic Instrument Legacy Imaging Surveys for precise galaxy shape measurements. We measure the galaxy–ellipticity correlation functions and model them using the linear alignment model. We constrain the distance DV/rd to redshift 0.57 to a precision of 3–5%, depending on the details of modelling. The galaxy–ellipticity measurement reduces the uncertainty of distance measurement by ~10% on top of that derived from the galaxy–galaxy correlation. More importantly, for future large and deep galaxy surveys, the independent galaxy–ellipticity measurements can help sort out the systematics in the baryon acoustic oscillation studies.

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Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations

Cited by 24 publications

References 73 publications

Prospects for detection and application of the alignment of galaxies with the large-scale velocity field

Prospects for detection and application of the alignment of galaxies with the large-scale velocity field

Analysis method for 3D power spectrum of projected tensor field with fast estimator and window convolution modelling: an application to intrinsic alignments

Evidence for baryon acoustic oscillations from galaxy–ellipticity correlations

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