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

作者：Nadathur Seshadri^*; Crittenden Robert

来源：Astrophysical Journal Letters, 2016, 830(1): L19.

DOI：10.3847/2041-8205/830/1/L19

• cosmic background radiation
• cosmology: observations
• cosmology: theory
• dark energy
• large-scale structure of universe

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 A(ISW) = 1.64 +/- 0.53 relative to the Lambda CDM expectation, corresponding to a 3.1 sigma detection. In contrast to some previous measurements of the ISW effect of superstructures, our result is in agreement with the Lambda CDM model.

• 出版日期2016-10-10