Journal article

Cross-correlating Planck with VST ATLAS LRGs: a new test for the ISW effect in the Southern hemisphere

Behzad Ansarinejad, Ruari Mackenzie, Tom Shanks, Nigel Metcalfe

Monthly Notices of the Royal Astronomical Society | Royal Astronomical Society | Published : 2020


The integrated Sachs–Wolfe (ISW) effect probes the late-time expansion history of the Universe, offering direct constraints on dark energy. Here, we present our measurements of the ISW signal at redshifts of z¯=0.35⁠, 0.55, and 0.68, using the cross-correlation of the Planck cosmic microwave background temperature map with ∼0.5 million luminous red galaxies (LRGs) selected from the VST ATLAS survey. We then combine these with previous measurements based on WMAP and similar SDSS LRG samples, providing a total sample of ∼2.1 million LRGs covering ∼12 000 deg2 of sky. At z¯=0.35 and z¯=0.55⁠, we detect the ISW signal at 1.2σ and 2.3σ (or 2.6σ combined), in agreement with the predictions of lamb..

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University of Melbourne Researchers


Awarded by Science and Technology Facilities Council

Funding Acknowledgements

Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions.SDSS-IV acknowledges support and resources from the Center for HighPerformance Computing at the University of Utah. The SDSS web site is is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian ParticipationGroup, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrof ' isica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut fur Astrophysik Potsdam (AIP), MaxPlanck-Institut fur Astronomie (MPIA Heidelberg), Max-PlanckInstitut fur Astrophysik (MPA Garching), Max-Planck-Institut fur Extraterrestrische Physik (MPE), National Astronomical Observatories of China, NewMexico State University, NewYork University, University of Notre Dame, Observatario Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad NacionalAutonoma deMexico, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University ofWashington, University ofWisconsin, Vanderbilt University, and Yale University. RM, TS & NM acknowledge the support of the Science and Technology Facilities Council (ST/L00075X/1 and ST/L000541/1)We would also like to thank Alina Talmantaite for her useful comments and discussion.