Locating the Baryon Acoustic Peak

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dc.creatorSimpson, Fergus
dc.creatorPeacock, John A.
dc.creatorSimon, Patrick
dc.date2009-01-20
dc.date2009-03-12
dc.date.accessioned2026-07-07T12:55:26Z
dc.date.available2026-07-07T12:55:26Z
dc.descriptionForthcoming photometric redshift surveys should provide an accurate probe of the acoustic peak in the two-point galaxy correlation function, in the form of angular clustering of galaxies within a given shell in redshift space. We investigate the form of the anticipated signal, quantifying the distortions that arise due to projection effects, and in particular explore the validity of applying the Limber approximation. A single-integral prescription is presented, which provides an alternative to Limber's equation, and produces a significantly improved prediction in the regime of interest. The position of the acoustic peak within the angular correlation function relates to the angular diameter distance to the far side of the redshift bin. Thicker redshift bins therefore shift comoving features towards smaller angular scales. As a result, the value of the photometric redshift error acquires a greater significance, particularly at lower redshifts. In order to recover the dark energy equation of state to a level of 1%, we find the total redshift dispersion must be determined to within Δσ_z ~ 10^-3, which may prove challenging to achieve in practice.
dc.description8 pages, 7 figures, minor changes reflect published version
dc.identifierhttps://arxiv.org/abs/0901.3085
dc.identifierhttp://arxiv.org/abs/0901.3085
dc.identifierPhys.Rev.D79:063508,2009
dc.identifierdoi:10.1103/PhysRevD.79.063508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224251
dc.subjectCosmology and Nongalactic Astrophysics
dc.titleLocating the Baryon Acoustic Peak
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