A MAP OF THE INTEGRATED SACHS-WOLFE SIGNAL FROM LUMINOUS RED GALAXIES

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-Wo...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 701; no. 1
Main Authors Granett, Benjamin R., Neyrinck, Mark C., Szapudi, Istvan
Format Journal Article
LanguageEnglish
Published United States 10.08.2009
Subjects
ACCELERATION
COSMOLOGY
GALAXIES
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HOT SPOTS
NONLUMINOUS MATTER
RELICT RADIATION
SIGNALS
UNIVERSE
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Summary: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 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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/701/1/414;COUNTRYOFINPUT:INTERNATIONALATOMICENERGYAGENCY(IAEA)