Integrated Sachs-Wolfe effect from the cross correlation of WMAP 3 year and the NRAO VLA sky survey data: New results and constraints on dark energy
By D. Pietrobon, A. Balbi, Domenico Marinucci. 2006
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We cross correlate the new 3 year Wilkinson Microwave Anistropy Probe (WMAP) cosmic microwave background data with the NRAO VLA Sky Survey radio galaxy data and find further evidence of late integrated Sachs-Wolfe (ISW) effect taking place at late times in cosmic history. Our detection makes use of a novel statistical method (P. Baldi, G. Kerkyacharian, D. Marinucci, and D. Picard, math.ST/0606154 and P. Baldi, G. Kerkyacharian, D. Marinucci, D. Picard, math.ST/0606599) based on a new construction of spherical wavelets, called needlets. The null hypothesis (no ISW) is excluded at more than 99.7% confidence. When we compare the measured cross correlation with the theoretical predictions of standard, flat cosmological models with a generalized dark energy component parameterized by its density, {omega}{sub DE}, equation of state w and speed of sound c{sub s}{sup 2}, we find 0.3{<=}{omega}{sub DE}{<=}0.8 at 95% C.L., independently of c{sub s}{sup 2} and w. If dark energy is assumed to be a cosmological constant (w=-1), the bound on density shrinks to 0.41{<=}{omega}{sub DE}{<=}0.79. Models without dark energy are excluded at more than 4{sigma}. The bounds on w depend rather strongly on the assumed value of c{sub s}{sup 2}. We find that models with more negative equation ofmore » state (such as phantom models) are a worse fit to the data in the case c{sub s}{sup 2}=1 than in the case c{sub s}{sup 2}=0.« less
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/c6361a68dcf0391ce25629f93c63bfee596aa25d
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In Astronomy and Astrophysics
Citations in the corpus
- A full sky, low foreground, high resolution CMB map from WMAP (2008, methodology): “To search for correlations of the CMB map with other emissions (Nolta et al. 2004; Fosalba & Gaztañaga 2004; Cabré et al. 2006; Cao et al. 2006; Pietrobon et al. 2006; McEwen et al. 2007; Rassat et al. 2007); –”
- Radio and millimeter continuum surveys and their astrophysical implications (2009, background): “…well-suited probe of the large-scale structure is the NVSS survey, and indeed this 45 has been extensively exploited to look for the ISW signal (Boughn & Crittenden 2004, 2005; Pietrobon et al. 2006; McEwen et al. 2007, 2008; Ho et al. 2008; Giannantonio et al. 2008; Raccanelli et al. 2008).”
- Spherical needlets for cosmic microwave background data analysis (2008, background): “Also, λjk denotes the cubature weights, which for simplicity can be envisaged as 1/Np, Np denoting the number of pixels (see Pietrobon et al. 2006).”