A DETECTION OF THE INTEGRATED SACHS-WOLFE IMPRINT OF COSMIC SUPERSTRUCTURES USING A MATCHED-FILTER APPROACH

• Published in: Astrophysical journal. Letters Vol. 830; no. 1; p. L19
• Main Authors: Nadathur, Seshadri, Crittenden, Robert
• Format: Journal Article
• Language: English
• Published: United States The American Astronomical Society 10.10.2016
• Subjects: Amplitudes; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; cosmic background radiation; Cosmic microwave background; COSMOLOGY; cosmology: observations; cosmology: theory; dark energy; DETECTION; Filtering; Filtration; GALAXIES; large-scale structure of universe; NONLUMINOUS MATTER; RELICT RADIATION; SIGNAL-TO-NOISE RATIO; SKY; Sky surveys (astronomy); Superstructures; UNIVERSE
• ISSN: 2041-8205; 2041-8213
• DOI: 10.3847/2041-8205/830/1/L19

ABSTRACT We present a new method for detection of the integrated Sachs-Wolfe (ISW) imprints of cosmic superstructures on the cosmic microwave background (CMB), based on a matched-filtering approach. The expected signal-to-noise ratio for this method is comparable to that obtained from the full cross-correlation, and unlike other stacked filtering techniques it is not subject to an a posteriori bias. We apply this method to Planck CMB data using voids and superclusters identified in the CMASS galaxy data from the Sloan Digital Sky Survey Data Release 12, and measure the ISW amplitude to be relative to the ΛCDM expectation, corresponding to a detection. In contrast to some previous measurements of the ISW effect of superstructures, our result is in agreement with the ΛCDM model.