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Title: Cosmological constraints from galaxy clusters in the 2500 square-degree SPT-SZ survey

Journal Article · · Astrophysical Journal
 [1]; ; ; ; ;  [2]; ;  [3];  [4];  [5]; ;  [6];  [7];  [8]; ; ;  [9];  [10];  [11];  [12] more »; « less
  1. Department of Physics, University of California, Berkeley, CA 94720 (United States)
  2. Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States)
  3. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
  4. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305 (United States)
  5. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn (Germany)
  6. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
  7. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States)
  8. Department of Physics and Astronomy, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States)
  9. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich (Germany)
  10. NIST Quantum Devices Group, Boulder, CO 80305 (United States)
  11. Departamento de Astronomia y Astrosifica, Pontificia Universidad Catolica (Chile)
  12. Department of Physics,McGill University, Montreal, Quebec H3A 2T8 (Canada)

We present cosmological parameter constraints obtained from galaxy clusters identified by their Sunyaev–Zel’dovich effect signature in the 2500 square-degree South Pole Telescope Sunyaev Zel’dovich (SPT-SZ) survey. We consider the 377 cluster candidates identified at z>0.25 with a detection significance greater than five, corresponding to the 95% purity threshold for the survey. We compute constraints on cosmological models using the measured cluster abundance as a function of mass and redshift. We include additional constraints from multi-wavelength observations, including Chandra X-ray data for 82 clusters and a weak lensing-based prior on the normalization of the mass-observable scaling relations. Assuming a spatially flat ΛCDM cosmology, we combine the cluster data with a prior on H {sub 0} and find σ{sub 8}=0.784±0.039 and Ω{sub m}=0.289±0.042, with the parameter combination σ{sub 8}(Ω{sub m}/0.27){sup 0.3}=0.797±0.031. These results are in good agreement with constraints from the cosmic microwave background (CMB) from SPT, WMAP, and Planck, as well as with constraints from other cluster data sets. We also consider several extensions to ΛCDM, including models in which the equation of state of dark energy w, the species-summed neutrino mass, and/or the effective number of relativistic species (N{sub eff}) are free parameters. When combined with constraints from the Planck CMB, H {sub 0}, baryon acoustic oscillation, and SNe, adding the SPT cluster data improves the w constraint by 14%, to w=−1.023±0.042.

OSTI ID:
22868446
Journal Information:
Astrophysical Journal, Vol. 832, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
Country of Publication:
United States
Language:
English

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