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A measurement of secondary cosmic microwave background anisotropies from the 2500-square-degree SPT-SZ survey

Aug 13, 2014
24 pages
Published in:
  • Astrophys.J. 799 (2015) 2, 177
  • Published: Jan 28, 2015
e-Print:
DOI:
Report number:
  • FERMILAB-PUB-14-372-A
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Abstract: (IOP)
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 D3000tSZ=4.08−0.67+0.58 μK2D^{\rm tSZ}_{3000} = 4.08^{+0.58}_{-0.67}\,\mu {\rm K}^2{} and the kSZ power to be D3000kSZ=2.9±1.3 μK2D^{\rm kSZ}_{3000} = 2.9 \pm 1.3\, \mu {\rm K}^2{}. The data prefer positive kSZ power at 98.1% CL. We measure a correlation coefficient of ξ=0.113−0.054+0.057\xi = 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.
Note:
  • Accepted by ApJ (v2 is accepted version); 12 figures; 24 pages
  • cosmic background radiation
  • cosmology: observations
  • dark ages, reionization, first stars
  • diffuse radiation
  • large-scale structure of universe
  • cosmic background radiation: anisotropy
  • cosmic background radiation: fluctuation
  • power spectrum: angular dependence
  • Sunyaev-Zel'dovich effect
  • galaxy: radio wave
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