Integrated Sachs-Wolfe imprint of superstructures on linear scales

Péter Pápai, István Szapudi, Benjamin R. Granett

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

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 Sloan Digital Sky Survey Luminous Red Galaxy sample. A matched filter analysis of the cosmic microwave background confirms a signal at the 3.2σ confidence level and estimates the radius of the underlying structures to be 55 ± 28 h -1 Mpc. The amplitude of the signal, however, is 2σ higher than ΛCDM predictions.

Original languageEnglish
Article number27
JournalAstrophysical Journal
Volume732
Issue number1
DOIs
Publication statusPublished - May 1 2011

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Keywords

  • cosmic background radiation
  • large-scale structure of universe
  • methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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