Detection of the ISW and SZ effects from the CMB-Galaxy correlation

Simple item page
dc.creatorFosalba, Pablo
dc.creatorGaztanaga, Enrique
dc.creatorCastander, Francisco
dc.date2003-07-14
dc.date2003-09-19
dc.date.accessioned2026-07-07T06:20:56Z
dc.date.available2026-07-07T06:20:56Z
dc.descriptionWe present a cross-correlation analysis of the WMAP cosmic microwave background (CMB) temperature anisotropies and the SDSS galaxy density fluctuations. We find significant detections of the angular CMB-galaxy correlation for both the flux limited galaxy sample (z~0.3) and the high redshift (z ~ 0.5) color selected sample. The signal is compatible with that expected from the integrated Sachs-Wolfe (ISW) effect at large angles (θ> 3deg) and the Sunyaev-Zeldovich (SZ) effect at small scales (θ< 1 deg). The detected correlation at low-z is in good agreement with a previous analysis using the APM survey (z~0.15). The combined analysis of all 3 samples yields a total significance better than 3 sigma for ISW and about 2.7 σfor SZ, with a Compton parameter y~10^(-6). For a given flat LCDM model, the ISW effect depends both on the value of Ω_Λand the galaxy bias b. To break this degeneracy, we estimate the bias using the ratio between the galaxy and mass auto-correlation functions in each sample. With our bias estimation, all samples consistently favor a best fit dark-energy dominated model: Ω_Λ~ 0.8, with a 2 σerror Ω_Λ=0.69-0.86.
dc.descriptionAccepted by ApJL. New figure and further discussion about error estimates
dc.identifierhttps://arxiv.org/abs/astro-ph/0307249
dc.identifierhttp://arxiv.org/abs/astro-ph/0307249
dc.identifierAstrophys.J. 597 (2003) L89-92
dc.identifierdoi:10.1086/379848
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95450
dc.subjectAstrophysics
dc.titleDetection of the ISW and SZ effects from the CMB-Galaxy correlation
dc.typetext

Files

Collections

arXiv