Figure 16 from Constraints on Cosmology from the Cosmic Microwave Background Power Spectrum of the 2500 deg2 SPT-SZ Survey

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Constraints on Cosmology from the Cosmic Microwave Background Power Spectrum of the 2500 deg2 SPT-SZ Survey

Authors: Z. Hou, C. L. Reichardt, K. T. Story, B. Follin, R. Keisler, K. A. Aird, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H.-M. Cho, T. M. Crawford, A. T. Crites, T. de Haan, R. de Putter, M. A. Dobbs, S. Dodelson, J. Dudley, E. M. George, N. W. Halverson, G. P. Holder, W. L. Holzapfel, S. Hoover, J. D. Hrubes, M. Joy, L. Knox, A. T. Lee, E. M. Leitch, M. Lueker, D. Luong-Van, J. J. McMahon, J. Mehl, S. S. Meyer, M. Millea, J. J. Mohr, T. E. Montroy, S. Padin, T. Plagge, C. Pryke, J. E. Ruhl, J. T. Sayre, K. K. Schaffer, L. Shaw, E. Shirokoff, H. G. Spieler, Z. Staniszewski, A. A. Stark, A. van Engelen, K. Vanderlinde, J. D. Vieira, R. Williamson, and O. Zahn

Hou et al. 2014 The Astrophysical Journal 782 74.

Provider: AAS Journals

Caption: Figure 16.

Changing N _eff introduces phase shifts in the acoustic oscillations, however, constraints on these phase shifts are weakened by a degeneracy between N _eff and θ _s. Here, we show the marginalized two-dimensional posteriors for N _eff and θ _s from the CMB data for the ΛCDM+ N _eff+ Y _p model. The black curve shows the correlation between the two parameters due to the phase shifts in the acoustic oscillations. This curve is defined using the Bashinsky & Seljak (2004) prescription for the phase shifts, normalized to the best-fit θ _s = 1.0429 × 10 ⁻² at N _eff = 3.046.

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