Alcock-Paczyński effect on void-finding: Implications for void-galaxy cross-correlation modelling
arXiv:2407.02699 · doi:10.1051/0004-6361/202451358
Abstract
Under the assumption of statistical isotropy, and in the absence of directional selection effects, a stack of voids is expected to be spherically symmetric, which makes it an excellent object to use for an Alcock-Paczyński (AP) test. This is commonly done using the void-galaxy cross-correlation function (CCF), which has emerged as a competitive probe, especially in combination with the galaxy-galaxy auto correlation function. Current studies of the AP effect around voids assume that the void centre positions transform under the choice of fiducial cosmology in the same way as galaxy positions. We show that this assumption, though prevalent in the literature, is complicated by the response of void-finding algorithms to shifts in tracer positions. Using stretched simulation boxes to emulate the AP effect, we investigate how the void-galaxy CCF changes under AP, revealing an additional effect imprinted in the CCF that must be accounted for. The effect comes from the response of void finders to the distorted tracer field, reducing the amplitude of the AP signal in the CCF, and thus depends on the specific void finding algorithm used. We present results for four different void finding packages: , , , and the spherical void finder in the library, demonstrating how incorrect treatment of the AP effect results in biases in the recovered parameters for all of them. Finally, we propose a method to alleviate this issue without resorting to complex and finder-specific modelling of the void finder response to AP.
arXiv comment19 pages, 15 figures, submitted to A&A
References in corpus (48)
- The Sloan Digital Sky Survey: Technical Summary
- The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
- SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
- Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
- The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
- Cobaya: Code for Bayesian Analysis of hierarchical physical models
- ZOBOV: a parameter-free void-finding algorithm
- The Quijote simulations
- An Imprint of Super-Structures on the Microwave Background due to the Integrated Sachs-Wolfe Effect
- Precision cosmography with stacked voids
- The Aspen--Amsterdam Void Finder Comparison Project
- Universal Density Profile for Cosmic Voids
- Constraints on Cosmology and Gravity from the Dynamics of Voids
- Counting voids to probe dark energy
- Beyond BAO: improving cosmological constraints from BOSS with measurement of the void-galaxy cross-correlation
- Simulating nonlinear cosmological structure formation with massive neutrinos
- Cosmic Voids and Void Lensing in the Dark Energy Survey Science Verification Data
- Clues on void evolution II: Measuring density and velocity profiles on SDSS galaxy redshift space distortions
- Redshift-space distortions around voids
- The VIMOS Public Extragalactic Redshift Survey: Measuring the growth rate of structure around cosmic voids
- A detection of the integrated Sachs-Wolfe imprint of cosmic superstructures using a matched-filter approach
- Large-Scale Clustering of Cosmic Voids
- Precision cosmology with voids in the final BOSS data
- 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
- Cosmic Voids in the SDSS DR12 BOSS Galaxy Sample: The Alcock-Paczynski Test
- On the linearity of tracer bias around voids
- More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy Survey
- Linear redshift space distortions for cosmic voids based on galaxies in redshift space
- Signatures of the Primordial Universe from Its Emptiness: Measurement of Baryon Acoustic Oscillations from Minima of the Density Field
- Euclid: Forecasts from redshift-space distortions and the Alcock-Paczynski test with cosmic voids
- The nature of voids: I. Watershed void finders and their connection with theoretical models
- Redshift-space distortions with split densities
- Testing cosmology with a catalogue of voids in the BOSS galaxy surveys
- Euclid: Cosmological forecasts from the void size function
- An accurate linear model for redshift space distortions in the void-galaxy correlation function
- Real-space density profile reconstruction of stacked voids
- New constraints on the linear growth rate using cosmic voids in the SDSS DR12 datasets
- Constraints on the growth of structure around cosmic voids in eBOSS DR14
- Measurement of the thermal Sunyaev-Zel'dovich effect around cosmic voids
- A Zeldovich reconstruction method for measuring redshift space distortions using cosmic voids
- Redshift-space effects in voids and their impact on cosmological tests. Part II: the void-galaxy cross-correlation function
- Euclid: Forecasts from the void-lensing cross-correlation
- The Gravitational Lensing Signatures of BOSS Voids in the Cosmic Microwave Background
- Why Cosmic Voids Matter: Nonlinear Structure & Linear Dynamics
- Non-fiducial cosmological test from geometrical and dynamical distortions around voids
- Euclid: Cosmology forecasts from the void-galaxy cross-correlation function with reconstruction
- Studying large-scale structure probes of modified gravity with COLA
- Velocity profiles of matter and biased tracers around voids