A Measurement of Secondary Cosmic Microwave Background Anisotropies from the 2500 Square-degree SPT-SZ Survey

• Published in: The Astrophysical Journal
• Main Authors: George, E. M., Crites, A. T., Lueker, M., Padin, S.
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Astronomical Society 2015
• Subjects: South Pole; South pole
• Online Access: https://authors.library.caltech.edu/55610/; https://authors.library.caltech.edu/55610/1/0004-637X_799_2_177.pdf; https://authors.library.caltech.edu/55610/2/1408.3161v2.pdf; https://resolver.caltech.edu/CaltechAUTHORS:20150306-141643827

We present measurements of secondary cosmic microwave background (CMB) anisotropies and cosmic infrared background (CIB) fluctuations using data from the South Pole Telescope (SPT) covering the complete 2540 deg^2 SPT-SZ survey area. Data in the three SPT-SZ frequency bands centered at 95, 150, and 220 GHz, are used to produce six angular power spectra (three single-frequency auto-spectra and three cross-spectra) covering the multipole range 2000 < ℓ < 11, 000 (angular scales 5' gsim θ gsim 1'). These are the most precise measurements of the angular power spectra at ℓ > 2500 at these frequencies. The main contributors to the power spectra at these angular scales and frequencies are the primary CMB, CIB, thermal and kinematic Sunyaev-Zel'dovich effects (tSZ and kSZ), and radio galaxies. We include a constraint on the tSZ power from a measurement of the tSZ bispectrum from 800 deg^2 of the SPT-SZ survey. We measure the tSZ power at 143 GHz to be D^(tSZ)_(3000) = 4.08^(+0.58)_(-0.67) µK^2 and the kSZ power to be D^(kSZ)_(3000) = 2.9 \pm 1.3 µK^2. The data prefer positive kSZ power at 98.1% CL. We measure a correlation coefficient of ξ = 0.113^(+0.057)_(-0.054) between sources of tSZ and CIB power, with ξ < 0 disfavored at a confidence level of 99.0%. The constraint on kSZ power can be interpreted as an upper limit on the duration of reionization. When the post-reionization homogeneous kSZ signal is accounted for, we find an upper limit on the duration Δz < 5.4 at 95% CL.