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Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications

T. GiannantonioInstitute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG, UKRyan ScrantonDepartment of Physics and Astronomy, University of Pittsburgh, 3941 O’Hara Street, Pittsburgh, Pennsylvania 15260, USARobert CrittendenInstitute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG, UKR. C. NicholInstitute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG, UKS. P. BoughnHaverford College, Haverford Pennsylvania 19041, USAAdam D. MyersDepartment of Astronomy, University of Illinois at Urbana–Champaign, Urbana, Illinois 61820, USAGordon T. RichardsDepartment of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, USA

2008en

ABI

Annotatsiya

We present a global measurement of the integrated Sachs-Wolfe (ISW) effect obtained by cross correlating all relevant large-scale galaxy data sets with the cosmic microwave background radiation map provided by the Wilkinson Microwave Anisotropy Probe. With these measurements, the overall ISW signal is detected at the $\ensuremath{\sim}4.5\ensuremath{\sigma}$ level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state $w$, its sound speed ${c}_{s}$, and the overall curvature of the Universe. The flat $\ensuremath{\Lambda}\mathrm{CDM}$ model is a good fit to the data and, assuming this model, we find that the ISW data constrain ${\ensuremath{\Omega}}_{m}={0.20}_{\ensuremath{-}0.11}^{+0.19}$ at the 95% confidence level. When we combine our ISW results with the latest baryon oscillation and supernovae measurements, we find that the result is still consistent with a flat $\ensuremath{\Lambda}\mathrm{CDM}$ model with $w=\ensuremath{-}1$ out to redshifts $z>1$.

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DOI: 10.1103/physrevd.77.123520

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