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

Tommaso Giannantonio
(
- Portsmouth U.
)
,
Ryan Scranton
(
- Pittsburgh U.
)
,
Robert G. Crittenden
(
- Portsmouth U.
)
,
Robert C. Nichol
(
- Portsmouth U.
)
,
Stephen P. Boughn
(
- Haverford Coll.
)

Jan, 2008

24 pages

Published in:

Phys.Rev.D 77 (2008) 123520

e-Print:

0801.4380 [astro-ph]

DOI:

10.1103/PhysRevD.77.123520

View in:

ADS Abstract Service

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Abstract: (arXiv)

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 - 4.5 sigma level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed, and the overall curvature of the Universe. The flat LCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Omega_m = 0.20 +0.12 -0.08 at the 95% confidence level. When we combine our ISW results with the latest BAO measurements, we find that the peak of the likelihood is shifted, by 1 sigma, towards phantom energy models (w < -1). The result obtained combining our ISW data with the SN data is instead consistent with w = -1.

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Figures(22)

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,
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,
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(
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