A DETECTION OF THE INTEGRATED SACHS-WOLFE IMPRINT OF COSMIC SUPERSTRUCTURES USING A MATCHED-FILTER APPROACH
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...
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| Published in | Astrophysical journal. Letters Vol. 830; no. 1; p. L19 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
The American Astronomical Society
10.10.2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2041-8205 2041-8213 |
| DOI | 10.3847/2041-8205/830/1/L19 |
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| Abstract | 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. |
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| AbstractList | 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 sub(ISW)= 1.64 + or - 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. 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. 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{sub ISW}=1.64±0.53 relative to the ΛCDM expectation, corresponding to a 3.1σ detection. In contrast to some previous measurements of the ISW effect of superstructures, our result is in agreement with the ΛCDM model. 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. |
| Author | Nadathur, Seshadri Crittenden, Robert |
| Author_xml | – sequence: 1 givenname: Seshadri orcidid: 0000-0001-9070-3102 surname: Nadathur fullname: Nadathur, Seshadri email: seshadri.nadathur@port.ac.uk organization: University of Portsmouth Institute of Cosmology and Gravitation, Burnaby Road, Portsmouth PO1 3FX, UK – sequence: 2 givenname: Robert surname: Crittenden fullname: Crittenden, Robert organization: University of Portsmouth Institute of Cosmology and Gravitation, Burnaby Road, Portsmouth PO1 3FX, UK |
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| Snippet | ABSTRACT We present a new method for detection of the integrated Sachs-Wolfe (ISW) imprints of cosmic superstructures on the cosmic microwave background (CMB),... 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... 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... |
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| SubjectTerms | 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 |
| Title | A DETECTION OF THE INTEGRATED SACHS-WOLFE IMPRINT OF COSMIC SUPERSTRUCTURES USING A MATCHED-FILTER APPROACH |
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