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Searching for a dipole modulation in the large-scale structure of the Universe

AutorFernández-Cobos, R. ; Vielva, P. ; Pietrobon, D.; Balbi, A.; Martínez-González, Enrique ; Barreiro, R. Belén
Fecha de publicación2014
EditorOxford University Press
Royal Astronomical Society
CitaciónMonthly Notices of the Royal Astronomical Society 441(3): 2392-2397 (2014)
ResumenSeveral statistical anomalies in the cosmic microwave background (CMB) temperature anisotropies seem to defy the assumption of a homogeneous and isotropic universe. In particular, a dipole modulation has been detected both in WMAP and Planck data. We adapt the methodology proposed by Eriksen et al. on CMBdata to galaxy surveys, tracing the large-scale structure. We analyse the National Radio Astronomy Observatory (NRAO) and Very Large Array (VLA) Sky Survey data at a resolution of ~2° for three different flux thresholds: 2.5, 5.0 and 10.0 mJy, respectively. No evidence of a dipole modulation is found. This result suggests that the origin of the dipole asymmetry found in the CMB cannot be assigned to secondary anisotropies produced at redshifts around z=1. However, it could still have been generated at redshifts higher or lower, such as the integrated Sachs-Wolfe effect produced by the local structures. Other all-sky surveys, like the infrared WISE catalogue, could help to explore with a high sensitivity a redshift interval closer than the one probed with NVSS. © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Versión del editorhttp://dx.doi.org/10.1093/mnras/stu749
Identificadoresdoi: 10.1093/mnras/stu749
e-issn: 1365-2966
issn: 0035-8711
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