A map of the integrated sachs-wolfe signal from luminous red galaxies

Benjamin R. Granett, Mark C. Neyrinck, Istvn Szapudi

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We construct a map of the time derivative of the gravitational potential traced by Sloan Digital Sky Survey luminous red galaxies (LRGs). The potential decays on large scales due to cosmic acceleration, leaving an imprint on cosmic microwave background (CMB) radiation through the integrated Sachs-Wolfe (ISW) effect. With a template fit, we directly measure this signature on the CMB at a 2σ confidence level. The measurement is consistent with the cross-correlation statistic, strengthening the claim that dark energy is indeed the cause of the correlation. This new approach potentially simplifies the cosmological interpretation. Our constructed linear ISW map shows no evidence for degree-scale cold and hot spots associated with supervoid and supercluster structures. This suggests that the linear ISW effect in a concordance ΛCDM cosmology is insufficient to explain the strong CMB imprints from these structures that we previously reported.

Original languageEnglish
Pages (from-to)414-422
Number of pages9
JournalAstrophysical Journal
Volume701
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • Cosmic microwave background
  • Cosmology: observations
  • Large-scale structure of universe
  • Methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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