A Map of the Integrated Sachs-Wolfe Signal from Luminous Red Galaxies

Details A Map of the Integrated Sachs-Wolfe Signal from Luminous Red Galaxies A Map of the Integrated Sachs-Wolfe Signal from Luminous Red Galaxies

2008-12-05

arxiv.org/abs/0812.1025v2

Astrophys.J.701:414-422,2009

Astronomy and Astrophysics

Astrophysics

9 pages, 12 figures, accepted to ApJ. Updated discussion about redshift cuts

Scientific paper

10.1088/0004-637X/701/1/414

We construct a map of the time derivative of the gravitational potential traced by SDSS Luminous Red Galaxies. 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 2-sigma 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 Lambda-CDM cosmology is insufficient to explain the strong CMB imprints from these structures that we previously reported.

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