The completed SDSS-IV extended baryon oscillation spectroscopic survey: geometry and growth from the anisotropic void–galaxy correlation function in the luminous red galaxy sample

Nadathur, Seshadri; Woodfinden, Alex; Percival, Will J.; Aubert, M; Bautista, Julian; Dawson, Kyle; Escoffier, S.; Fromenteau, S.; Gil-Marín, Héctor; Rich, J.; Ross, Ashley J.; Rossi, Graziano; Magaña, Mariana Vargas; Brownstein, Joel R.; Schneider, Donald P.

doi:10.1093/mnras/staa3074

Cited by 59 publications

(73 citation statements)

References 84 publications

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“…The method consists of recovering the real-space position of the galaxies based on the Zel'dovich approximation. This method has now been applied to the case of voids (Nadathur et al 2019a(Nadathur et al , 2020, showing robustness in recovering the real-space statistical properties of voids, such as their density and velocity profiles, and achieving unbiased cosmological constraints. Given that this procedure depends on the cosmological parameters, it must be applied iteratively in combination with the void finding step.…”

Section: Introductionmentioning

confidence: 99%

“…Two of the most important cosmological statistics in void studies are the void size function, that describes the abundance of voids (Sheth & van de Weygaert 2004;Furlanetto & Piran 2006;Jennings et al 2013;Achitouv et al 2015;Pisani et al 2015;Ronconi & Marulli 2017;Contarini et al 2019;Ronconi et al 2019;Verza et al 2019), and the void-galaxy cross-correlation function, that characterises the density and peculiar velocity fields around them (Paz et al 2013;Hamaus et al 2015;Cai et al 2016;Hamaus et al 2016;Achitouv 2017;Achitouv et al 2017;Chuang et al 2017;Hamaus et al 2017;Hawken et al 2017;Achitouv 2019;Nadathur & Percival 2019;Nadathur et al 2019a,b;Hawken et al 2020;Hamaus et al 2020;Nadathur et al 2020;Paillas et al 2021). Both statistics are affected by distortions in the observed spatial distribution of the galaxies, which translate into anisotropic patterns.…”

Section: Introductionmentioning

confidence: 99%

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Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

Correa

Paz

Sánchez

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Voids are promising cosmological probes. Nevertheless, every cosmological test based on voids must necessarily employ methods to identify them in redshift space. Therefore, redshift-space distortions (RSD) and the Alcock-Paczyński effect (AP) have an impact on the void identification process itself generating distortion patterns in observations. Using a spherical void finder, we developed a statistical and theoretical framework to describe physically the connection between the identification in real and redshift space. We found that redshift-space voids above the shot noise level have a unique real-space counterpart spanning the same region of space, they are systematically bigger and their centres are preferentially shifted along the line of sight. The expansion effect is a by-product of RSD induced by tracer dynamics at scales around the void radius, whereas the off-centring effect constitutes a different class of RSD induced at larger scales by the global dynamics of the whole region containing the void. The volume of voids is also altered by the fiducial cosmology assumed to measure distances, this is the AP change of volume. These three systematics have an impact on cosmological statistics. In this work, we focus on the void size function. We developed a theoretical framework to model these effects and tested it with a numerical simulation, recovering the statistical properties of the abundance of voids in real space. This description depends strongly on cosmology. Hence, we lay the foundations for improvements in current models of the abundance of voids in order to obtain unbiased cosmological constraints from redshift surveys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

Correa

Paz

Sánchez

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…The study of the voidgalaxy cross-correlation function is a rich field of research and has already provided stringent constraints from current data (e.g. Hamaus et al 2016;Hawken et al 2017;Hamaus et al 2020;Aubert et al 2020;Nadathur et al 2020), through its use of voids as standard spheres for the Alcock-Paczyński test (Alcock & Paczynski 1979;Lavaux & Wandelt 2012) and the redshift-space distortion analysis around void centers. Unlocking small scales with Roman will strongly contribute to tighten such constraints.…”

Section: Void Cosmologymentioning

confidence: 99%

The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope

Wang,

Zhai,

Alavi

et al. 2021

Preprint

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The Nancy Grace Roman Space Telescope will conduct a High Latitude Spectroscopic Survey (HLSS) over a large volume at high redshift, using the near-IR grism (1.0-1.93 µm, R = 435 − 865) and the 0.28 deg 2 wide field camera. We present a reference HLSS which maps 2000 deg 2 and achieves an emission line flux limit of 10 −16 erg/s/cm 2 at 6.5σ, requiring ∼0.6 yrs of observing time. We summarize the flowdown of the Roman science objectives to the science and technical requirements of the HLSS. We construct a mock redshift survey over the full HLSS volume by applying a semi-analytic galaxy formation model to a cosmological N-body simulation, and use this mock survey to create pixel-level simulations of 4 deg 2 of HLSS grism spectroscopy. We find that the reference HLSS would measure ∼ 10 million Hα galaxy redshifts that densely map large scale structure at z = 1 − 2 and 2 million [OIII] galaxy redshifts that sparsely map structures at z = 2 − 3. We forecast the performance of this survey for measurements of the cosmic expansion history with baryon acoustic oscillations and the growth of large scale structure with redshift space distortions. We also study possible deviations from the reference design, and find that a deep HLSS at f line > 7 × 10 −17 erg/s/cm 2 over 4000 deg 2 (requiring ∼1.5 yrs of observing time) provides the most compelling stand-alone constraints on dark energy from Roman alone. This provides a useful reference for future optimizations. The reference survey, simulated data sets, and forecasts presented here will inform community decisions on the final scope and design of the Roman HLSS.

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“…We use the publicly available REVOLVER (REal-space VOid Locations from surVEy Reconstruction) 1 void finder to build our void catalogues with the ZOBOV (ZOnes Bordering On Voidness) algorithm (Neyrinck (2008)), which is a 3D void finder and has been widely used both in simulations and observed catalogues (Jeffrey et al (2021); Nadathur et al (2020); Contarini et al (2021); Nadathur et al (2020)). The ZOBOV algorithm performs a Voronoi tessellation of a set of points, identifies depressions in the density distribution of these points, and merges them into group of Voronoi cells using a watershed transform (Platen et al 2007) without pre-determined assumptions about voids shape, size or mean underdensity, which is the most appealing aspect of the watershed method.…”

Section: Void Findermentioning

confidence: 99%

Cosmic voids and BAO with relative baryon-CDM perturbations

Khoraminezhad,

Vielzeuf,

Lazeyras

et al. 2021

Preprint

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We study the statistics of various large-scale structure tracers in gravity-only cosmological simulations including baryons and cold dark matter (CDM) initialized with two different transfer functions, and simulated as two distinct fluids. This allows us to study the impact of baryon-CDM relative perturbations on these statistics. In particular, we focus on the statistics of cosmic voids, as well as on the matter and halo real-space 2-point correlation function and baryon acoustic oscillations (BAO) peak. We find that the void size function is affected at the 1-2% level at maximum, and that the impact is more important at higher redshift, while the void density profile and void bias are roughly unaffected. We do not detect a sizeable impact of relative baryon-CDM perturbations on the real-space correlation functions of matter and halos or the BAO peak, which is in line with results from previous works. Our results imply that it would be hard to use voids or real-space correlation functions to constrain baryon-CDM relative perturbations, but also that we might not have to include them in models for the analysis of future cosmological surveys data.

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The completed SDSS-IV extended baryon oscillation spectroscopic survey: geometry and growth from the anisotropic void–galaxy correlation function in the luminous red galaxy sample

Cited by 59 publications

References 84 publications

Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope

Cosmic voids and BAO with relative baryon-CDM perturbations

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