Figure 17 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 17.

This plot contrasts the CMB-derived two-dimensional likelihood contours for N _eff and Y _p with the predictions of BBN and other Y _p measurements. The black solid contours are the 68% and 95% confidence intervals for SPT+ WMAP 7. The scattered points are samples from the Markov chain with the color encoding the value of θ _d/θ _s. The dashed black curve marks the standard BBN relationship between N _eff and Y _p . Similar to the right panel of Figure 15, the gray area is ruled out by the 95% upper limit of the measurement of solar initial helium abundance by Serenelli & Basu (2010). The Y _p measurement from spectral observations of extragalactic low-metallicity ionized gas clouds by Peimbert et al. (2007) and Aver et al. (2012) are shown by the light blue and red bands respectively.

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