ISW Imprint of Superstructures on Linear Scales

Details ISW Imprint of Superstructures on Linear Scales ISW Imprint of Superstructures on Linear Scales

2010-12-16

arxiv.org/abs/1012.3750v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 Pages, 7 Figures, Submitted to ApJ

Scientific paper

We build a model for the density and integrated Sachs-Wolfe (ISW) profile of supervoid and supercluster structures. Our model assumes that fluctuations evolve linearly from an initial Gaussian random field. We find these assumptions capable of describing N-body simulations and simulated ISW maps remarkably well on large scales. We construct an ISW map based on locations of superstructures identified previously in the SDSS Luminous Red Galaxy sample. A matched filter analysis of the cosmic microwave background confirms a signal at the $3.2-\sigma$ confidence level and estimates the radius of the underlying structures to be $55 \pm 28 ~h^{-1}$Mpc. The amplitude of the signal, however, is $2-\sigma$ higher than $\Lambda$CDM predictions.

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