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

T. Giannantonio; R. Scranton; Robert Crittenden; Bob Nichol; S. Boughn; A. Myers; G. Richards

doi:10.1103/PhysRevD.77.123520

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

T. Giannantonio, R. Scranton, Robert Crittenden, Bob Nichol, S. Boughn, A. Myers, G. Richards

Institute of Cosmology & Gravitation

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Abstract

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 ∼4.5σ level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed cs, and the overall curvature of the Universe. The flat ΛCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Ωm=0.20-0.11+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 ΛCDM model with w=-1 out to redshifts z>1.

Original language	English
Pages (from-to)	123520
Number of pages	1
Journal	Physical Review D
Volume	77
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevD.77.123520
Publication status	Published - 13 Jun 2008

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title = "Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications",

abstract = "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 ∼4.5σ level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed cs, and the overall curvature of the Universe. The flat ΛCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Ωm=0.20-0.11+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 ΛCDM model with w=-1 out to redshifts z>1.",

author = "T. Giannantonio and R. Scranton and Robert Crittenden and Bob Nichol and S. Boughn and A. Myers and G. Richards",

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language = "English",

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T1 - Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications

AU - Giannantonio, T.

AU - Scranton, R.

AU - Crittenden, Robert

AU - Nichol, Bob

AU - Boughn, S.

AU - Myers, A.

AU - Richards, G.

PY - 2008/6/13

Y1 - 2008/6/13

N2 - 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 ∼4.5σ level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed cs, and the overall curvature of the Universe. The flat ΛCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Ωm=0.20-0.11+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 ΛCDM model with w=-1 out to redshifts z>1.

AB - 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 ∼4.5σ level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed cs, and the overall curvature of the Universe. The flat ΛCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Ωm=0.20-0.11+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 ΛCDM model with w=-1 out to redshifts z>1.

U2 - 10.1103/PhysRevD.77.123520

DO - 10.1103/PhysRevD.77.123520

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JO - Physical Review D

JF - Physical Review D

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ER -

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

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