0000000001115872

AUTHOR

A. Labatie

showing 3 related works from this author

Wavelet analysis of baryon acoustic structures in the galaxy distribution

2011

Baryon Acoustic Oscillations (BAO) are a feature imprinted in the density field by acoustic waves travelling in the plasma of the early universe. Their fixed scale can be used as a standard ruler to study the geometry of the universe. BAO have been previously detected using correlation functions and power spectra of the galaxy distribution. In this work, we present a new method for the detection of the real-space structures associated with this feature. These baryon acoustic structures are spherical shells with a relatively small density contrast, surrounding high density central regions. We design a specific wavelet adapted to the search for shells, and exploit the physics of the process b…

Cosmology and Nongalactic Astrophysics (astro-ph.CO)Cold dark mattermedia_common.quotation_subjectFOS: Physical sciencesContext (language use)AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciences0103 physical sciencesDensity contrast010303 astronomy & astrophysicsmedia_commonPhysicsmethods: statistical[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]010308 nuclear & particles physicsgalaxies: cluster: generalAstronomy and AstrophysicsAcoustic wavecosmology: distance scalecosmology: large-scale structure of Universemethods: data analysisUniverseGalaxyBaryonSpace and Planetary ScienceBaryon acoustic oscillationsAstrophysics - Cosmology and Nongalactic Astrophysics
researchProduct

Uncertainty in 2-point correlation function estimators and baryon acoustic oscillation detection in galaxy surveys

2012

Abstract We study the uncertainty in different two-point correlation function (2PCF) estimators in currently available galaxy surveys. This is motivated by the active subject of using the baryon acoustic oscillations (BAOs) feature in the correlation function as a tool to constrain cosmological parameters, which requires a fine analysis of the statistical significance. We discuss how estimators are affected by both the uncertainty in the mean density n and the integral constraint 1 V 2 ∫ V 2 ξ ˆ ( r ) d 3 r = 0 which necessarily causes a bias. We quantify both effects for currently available galaxy samples using simulated mock catalogues of the Sloan Digital Sky Survey (SDSS) following a lo…

Statistics and ProbabilityNumber density010308 nuclear & particles physicsmedia_common.quotation_subjectDark matterEstimatorAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesRedshiftGalaxyBaryonSky0103 physical sciencesBaryon acoustic oscillationsStatistical physics010303 astronomy & astrophysicsmedia_commonMathematicsStatistical Methodology
researchProduct

Baryon Acoustic Oscillations in LRGs

2012

Baryon Acoustic Oscillations (BAO) have been previously detected using correlation functions and power spectra of the galaxy distribution. In this work, we present a new method for the detection of the real-space structures associated with this feature. These baryon acoustic structures are spherical shells with a relatively small density contrast, surrounding high density central regions. We design a specific wavelet adapted to the search for shells, and exploit the physics of the process by making use of two different mass tracers, introducing a specific statistic to detect the BAO features. We apply our method to the detection of BAO in a galaxy sample drawn from the Sloan Digital Sky Sur…

observational astronomygalactic and extragalactic astronomyAstrophysics and AstronomyPhysicsAstrophysics::Instrumentation and Methods for AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsRedshiftedCatalogsGalaxiesNatural SciencesComputer Science::Digital LibrariescosmologyAstrophysics::Galaxy Astrophysics
researchProduct