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Photo-z optimization for measurements of the BAO radial scale

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Photo-z optimization for measurements of the BAO radial scale

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dc.contributor.author	Roig Barba, Daniel
dc.contributor.author	Verde, Licia
dc.contributor.author	Miralda Escude, Jordi
dc.contributor.author	Jiménez, Raúl
dc.contributor.author	Peña Garay, Carlos
dc.date.accessioned	2014-11-03T11:17:08Z
dc.date.available	2014-11-03T11:17:08Z
dc.date.issued	2009
dc.identifier.citation	Roig Barba, Daniel Verde, Licia Miralda Escude, Jordi Jiménez, Raúl Peña Garay, Carlos 2009 Photo-z optimization for measurements of the BAO radial scale Journal Of Cosmology And Astroparticle Physics 2009 4 008
dc.identifier.uri	http://hdl.handle.net/10550/39532
dc.description.abstract	Baryon Acoustic Oscillations (BAO) in the radial direction offer a method to directly measure the Universe expansion history, and to set limits to space curvature when combined to the angular BAO signal. In addition to spectroscopic surveys, radial BAO might be measured from accurate enough photometric redshifts obtained with narrow-band filters. We explore the requirements for a photometric survey using Luminous Red Galaxies (LRG) to competitively measure the radial BAO signal and discuss the possible systematic errors of this approach. Using the LRG spectra obtained from SDSS, we find that the optimal system consists of similar to 30 filters of width Delta lambda/lambda similar to 0:02. A S/N > 20 is generally necessary at the filters on the red side of the Balmer-break to reach the target photometric accuracy sigma(z) = 0.003(1 + z) for measuring radial BAO. The presence of outliers can significantly degrade this: in any practical application, being able to efficiently remove outliers may require ancillary observations. We estimate that a 5-year survey in a dedicated telescope with etendue in excess of 60 m(2) deg(2) would be necessary to obtain a high enough density of galaxies to measure the radial BAO with shot noise smaller than cosmic variance upto z = 0.85. We conclude that spectroscopic surveys have a superior performance than photometric ones for measuring BAO in the radial direction.
dc.language.iso	eng
dc.relation.ispartof	Journal Of Cosmology And Astroparticle Physics, 2009, vol. 2009, num. 4, p. 008
dc.subject	Astronomia
dc.title	Photo-z optimization for measurements of the BAO radial scale
dc.type	journal article	es_ES
dc.date.updated	2014-11-03T11:17:09Z
dc.identifier.doi	10.1088/1475-7516/2009/04/008
dc.identifier.idgrec	097434
dc.rights.accessRights	open access	es_ES