Redshift-space effects in voids and their impact on cosmological tests - II. The void-galaxy cross-correlation function

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dc.contributor.authorCorrea, Carlos M.
dc.contributor.authorPaz, Dante J.
dc.contributor.authorPadilla, Nelson D.
dc.contributor.authorSanchez, Ariel G.
dc.contributor.authorRuiz, Andres N.
dc.contributor.authorAngulo, Raul E.
dc.date.accessioned2025-01-20T22:01:24Z
dc.date.available2025-01-20T22:01:24Z
dc.date.issued2022
dc.description.abstractThis is the second part of a thorough investigation of the redshift-space effects that affect void properties and the impact they have on cosmological tests. Here, we focus on the void-galaxy cross-correlation function, specifically, on the projected versions that we developed in a previous work. The pillar of the analysis is the one-to-one relationship between real and redshift-space voids above the shot-noise level identified with a spherical void finder. Under this mapping, void properties are affected by three effects: (i) a systematic expansion as a consequence of the distortions induced by galaxy dynamics, (ii) the Alcock-Paczynski volume effect, which manifests as an overall expansion or contraction depending on the fiducial cosmology, and (iii) a systematic off-centring along the line of sight as a consequence of the distortions induced by void dynamics. We found that correlations are also affected by an additional source of distortions: the ellipticity of voids. This is the first time that distortions due to the off-centring and ellipticity effects are detected and quantified. With a simplified test, we verified that the Gaussian streaming model is still robust provided all these effects are taken into account, laying the foundations for improvements in current models in order to obtain unbiased cosmological constraints from spectroscopic surveys. Besides this practical importance, this analysis also encodes key information about the structure and dynamics of the Universe at the largest scales. Furthermore, some of the effects constitute cosmological probes by themselves, as is the case of the void ellipticity.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stab3070
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stab3070
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93823
dc.identifier.wosidWOS:000728381700022
dc.issue.numero2
dc.language.isoen
dc.pagina.final1884
dc.pagina.inicio1871
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: distances and redshifts
dc.subjectcosmological parameters
dc.subjectdark energy
dc.subjectdistance scale
dc.subjectlarge-scale structure of Universe
dc.titleRedshift-space effects in voids and their impact on cosmological tests - II. The void-galaxy cross-correlation function
dc.typeartículo
dc.volumen509
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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