A Caltech Library Service

A Measurement of Secondary Cosmic Microwave Background Anisotropies with Two Years of South Pole Telescope Observations

Reichardt, C. L. and Lueker, M. and Padin, S. and Vieira, J. D. (2012) A Measurement of Secondary Cosmic Microwave Background Anisotropies with Two Years of South Pole Telescope Observations. Astrophysical Journal, 755 (1). Art. No. 70. ISSN 0004-637X.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present the first three-frequency South Pole Telescope (SPT) cosmic microwave background (CMB) power spectra. The band powers presented here cover angular scales 2000 < ℓ < 9400 in frequency bands centered at 95, 150, and 220 GHz. At these frequencies and angular scales, a combination of the primary CMB anisotropy, thermal and kinetic Sunyaev-Zel'dovich (SZ) effects, radio galaxies, and cosmic infrared background (CIB) contributes to the signal. We combine Planck/HFI and SPT data at 220 GHz to constrain the amplitude and shape of the CIB power spectrum and find strong evidence for nonlinear clustering. We explore the SZ results using a variety of cosmological models for the CMB and CIB anisotropies and find them to be robust with one exception: allowing for spatial correlations between the thermal SZ effect and CIB significantly degrades the SZ constraints. Neglecting this potential correlation, we find the thermal SZ power at 150 GHz and ℓ = 3000 to be 3.65 ± 0.69 μK^2, and set an upper limit on the kinetic SZ power to be less than 2.8 μK^2 at 95% confidence. When a correlation between the thermal SZ and CIB is allowed, we constrain a linear combination of thermal and kinetic SZ power: D^(tSZ)_(3000) + 0.5D^(kSZ)_(3000) = 4.60 ± 0.63 μK^2, consistent with earlier measurements. We use the measured thermal SZ power and an analytic, thermal SZ model calibrated with simulations to determine σ_8 = 0.807 ± 0.016. Modeling uncertainties involving the astrophysics of the intracluster medium rather than the statistical uncertainty in the measured band powers are the dominant source of uncertainty on σ_8. We also place an upper limit on the kinetic SZ power produced by patchy reionization; a companion paper uses these limits to constrain the reionization history of the universe.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 2012 American Astronomical Society. Received 2012 April 25; accepted 2012 June 12; published 2012 July 26. We thank Cien Shang, Guilaine Lagache, Olivier Dore, and Marco Viero for useful discussions and assistance with the CIB modeling. The South Pole Telescope is supported by the National Science Foundation through grants ANT-0638937 and ANT-0130612. Partial support is also provided by the NSF Physics Frontier Center grant PHY-0114422 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation. The McGill group acknowledges funding from the National Sciences and Engineering Research Council of Canada, Canada Research Chairs program, and the Canadian Institute for Advanced Research. R.K. acknowledges support from NASA Hubble Fellowship grant HF-51275.01. B.A.B. is supported by a KICP Fellowship. M.D. acknowledges support from an Alfred P. Sloan Research Fellowship. L.S. acknowledges the support of Yale University and NSF grant AST-1009811. M.M. and L.K. acknowledge the support of NSF grant 0709498. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Some of the results in this paper have been derived using the HEALPix (Górski et al. 2005) package. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA). Support for LAMBDA is provided by the NASA Office of Space Science.
Funding AgencyGrant Number
NSF Physics Frontier CenterPHY-0114422
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Research Chairs programUNSPECIFIED
Canadian Institute for Advanced Research (CIAR)UNSPECIFIED
NASA Hubble Fellowship grantHF-51275.01
Alfred P. Sloan Research FellowshipUNSPECIFIED
Yale UniversityUNSPECIFIED
Department of Energy (DOE)DE-AC02-05CH11231
NASA Office of Space ScienceUNSPECIFIED
Subject Keywords:cosmic background radiation; cosmological parameters; cosmology: observations; diffuse radiation; large-scale structure of universe
Issue or Number:1
Record Number:CaltechAUTHORS:20120831-102102615
Persistent URL:
Official Citation:A Measurement of Secondary Cosmic Microwave Background Anisotropies with Two Years of South Pole Telescope Observations C. L. Reichardt et al. 2012 ApJ 755 70
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33761
Deposited By: Jason Perez
Deposited On:31 Aug 2012 18:14
Last Modified:03 Oct 2019 04:13

Repository Staff Only: item control page