DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
We present measurements of anisotropy in the Cosmic Microwave Background (CMB) from the first season of observations with the Degree Angular Scale Interferometer (DASI). The instrument was deployed at the South Pole in the austral summer 1999--2000, and made observations throughout the following aus...
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ftcern:oai:cds.cern.ch:497736 2023-05-15T18:22:40+02:00 DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum Halverson, N W Leitch, E M Pryke, C L Kovács, J Carlstrom, J E Holzapfel, W L Dragovan, M Cartwright, J K Mason, B S Padin, S Pearson, T J Shepherd, M C Readhead, A C S 2001-04-30 http://cds.cern.ch/record/497736 eng eng http://cds.cern.ch/record/497736 astro-ph/0104489 oai:cds.cern.ch:497736 Astrophysics and Astronomy 2001 ftcern 2018-07-28T04:59:36Z We present measurements of anisotropy in the Cosmic Microwave Background (CMB) from the first season of observations with the Degree Angular Scale Interferometer (DASI). The instrument was deployed at the South Pole in the austral summer 1999--2000, and made observations throughout the following austral winter. We have measured the angular power spectrum of the CMB in the range 100<l<900 with high signal-to-noise. In this paper we review the formalism used in the analysis, in particular the use of constraint matrices to project out contaminants such as ground and point source signals, and to test for correlations with diffuse foreground templates. We find no evidence of foregrounds other than point sources in the data, and find a maximum likelihood temperature spectral index beta = -0.1 +/- 0.2 (1 sigma), consistent with CMB. We detect a first peak in the power spectrum at l approx 200, in agreement with previous experiments. In addition, we detect a peak in the power spectrum at l approx 550 and power of similar magnitude at l approx 800 which are consistent with the second and third harmonic peaks predicted by adiabatic inflationary cosmological models. Other/Unknown Material South pole CERN Document Server (CDS) Austral South Pole |
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CERN Document Server (CDS) |
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English |
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Astrophysics and Astronomy |
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Astrophysics and Astronomy Halverson, N W Leitch, E M Pryke, C L Kovács, J Carlstrom, J E Holzapfel, W L Dragovan, M Cartwright, J K Mason, B S Padin, S Pearson, T J Shepherd, M C Readhead, A C S DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum |
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Astrophysics and Astronomy |
description |
We present measurements of anisotropy in the Cosmic Microwave Background (CMB) from the first season of observations with the Degree Angular Scale Interferometer (DASI). The instrument was deployed at the South Pole in the austral summer 1999--2000, and made observations throughout the following austral winter. We have measured the angular power spectrum of the CMB in the range 100<l<900 with high signal-to-noise. In this paper we review the formalism used in the analysis, in particular the use of constraint matrices to project out contaminants such as ground and point source signals, and to test for correlations with diffuse foreground templates. We find no evidence of foregrounds other than point sources in the data, and find a maximum likelihood temperature spectral index beta = -0.1 +/- 0.2 (1 sigma), consistent with CMB. We detect a first peak in the power spectrum at l approx 200, in agreement with previous experiments. In addition, we detect a peak in the power spectrum at l approx 550 and power of similar magnitude at l approx 800 which are consistent with the second and third harmonic peaks predicted by adiabatic inflationary cosmological models. |
author |
Halverson, N W Leitch, E M Pryke, C L Kovács, J Carlstrom, J E Holzapfel, W L Dragovan, M Cartwright, J K Mason, B S Padin, S Pearson, T J Shepherd, M C Readhead, A C S |
author_facet |
Halverson, N W Leitch, E M Pryke, C L Kovács, J Carlstrom, J E Holzapfel, W L Dragovan, M Cartwright, J K Mason, B S Padin, S Pearson, T J Shepherd, M C Readhead, A C S |
author_sort |
Halverson, N W |
title |
DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum |
title_short |
DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum |
title_full |
DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum |
title_fullStr |
DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum |
title_full_unstemmed |
DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum |
title_sort |
dasi first results: a measurement of the cosmic microwave background angular power spectrum |
publishDate |
2001 |
url |
http://cds.cern.ch/record/497736 |
geographic |
Austral South Pole |
geographic_facet |
Austral South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://cds.cern.ch/record/497736 astro-ph/0104489 oai:cds.cern.ch:497736 |
_version_ |
1766202075088158720 |