Cross-correlation of 2MASS and WMAP3: Implications for the Integrated Sachs-Wolfe effect

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dc.creatorRassat, Anais
dc.creatorLand, Kate
dc.creatorLahav, Ofer
dc.creatorAbdalla, Filipe B.
dc.date2006-10-30
dc.date2007-04-03
dc.date.accessioned2026-07-07T11:00:03Z
dc.date.available2026-07-07T11:00:03Z
dc.descriptionWe perform a cross-correlation of the Cosmic Microwave Background (CMB) using the third year Wilkinson Microwave Anisotropy Probe (WMAP) data with the 2 Micron All Sky Survey (2MASS) galaxy map (about 828 000 galaxies with median redshift z ~ 0.07). One motivation is to detect the Integrated Sachs-Wolfe (ISW) effect, expected if the cosmic gravitational potential is time dependent; for example, as it is in a flat universe with a Dark Energy component. The measured spherical harmonic cross-correlation signal favours the ISW signal expected in the concordance LambdaCDM model over that of zero correlation, although both are consistent with the data within 2sigma. Within a flat LambdaCDM model we find a best fit value of Omega_Lambda=0.85 and Omega_Lambda < 0.89 (95% CL). The above limits assume a galaxy bias b_g(sigma_8/0.75) ~ 1.40 +/- 0.03, which we derived directly from the 2MASS auto-correlation. Another goal is to test if previously reported anomalies in the WMAP data are related to the galaxy distribution (the so-called ``Axis of Evil'' - AoE). No such anomaly is observed in the 2MASS data nor are there any observed AoE correlations between the 2MASS and WMAP3 data.
dc.description12 pages. Accepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0610911
dc.identifierhttp://arxiv.org/abs/astro-ph/0610911
dc.identifierMon.Not.Roy.Astron.Soc.377:1085-1094,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.11538.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187608
dc.subjectAstrophysics
dc.titleCross-correlation of 2MASS and WMAP3: Implications for the Integrated Sachs-Wolfe effect
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