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2013ApJ...763..147B -
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Astrophys. J., 763, 147 (2013/February-1)
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Cosmological constraints from sunyaev-zel'dovich-selected clusters with X-ray observations in the first 178 deg ^{2} of the south pole telescope survey.
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BENSON B.A., DE HAAN T., DUDLEY J.P., REICHARDT C.L., AIRD K.A., ANDERSSON K., ARMSTRONG R., ASHBY M.L.N., BAUTZ M., BAYLISS M., BAZIN G., BLEEM L.E., BRODWIN M., CARLSTROM J.E., CHANG C.L., CHO H.M., CLOCCHIATTI A., CRAWFORD T.M., CRITES A.T., DESAI S., DOBBS M.A., FOLEY R.J., FORMAN W.R., GEORGE E.M., GLADDERS M.D., GONZALEZ A.H., HALVERSON N.W., HARRINGTON N., HIGH F.W., HOLDER G.P., HOLZAPFEL W.L., HOOVER S., HRUBES J.D., JONES C., JOY M., KEISLER R., KNOX L., LEE A.T., LEITCH E.M., LIU J., LUEKER M., LUONG-VAN D., MANTZ A., MARRONE D.P., McDONALD M., McMAHON J.J., MEHL J., MEYER S.S., MOCANU L., MOHR J.J., MONTROY T.E., MURRAY S.S., NATOLI T., PADIN S., PLAGGE T., PRYKE C., REST A., RUEL J., RUHL J.E., SALIWANCHIK B.R., SARO A., SAYRE J.T., SCHAFFER K.K., SHAW L., SHIROKOFF E., SONG J., SPIELER H.G., STALDER B., STANISZEWSKI Z., STARK A.A., STORY K., STUBBS C.W., SUHADA R., VAN ENGELEN A., VANDERLINDE K., VIEIRA J.D., VIKHLININ A., WILLIAMSON R., ZAHN O. and ZENTENO A.
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Abstract (from CDS):
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We use measurements from the South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) cluster survey in combination with X-ray measurements to constrain cosmological parameters. We present a statistical method that fits for the scaling relations of the SZ and X-ray cluster observables with mass while jointly fitting for cosmology. The method is generalizable to multiple cluster observables, and self-consistently accounts for the effects of the cluster selection and uncertainties in cluster mass calibration on the derived cosmological constraints. We apply this method to a data set consisting of an SZ-selected catalog of 18 galaxy clusters at z > 0.3 from the first 178 deg^{2} of the 2500 deg^{2} SPT-SZ survey, with 14 clusters having X-ray observations from either Chandra or XMM-Newton. Assuming a spatially flat ΛCDM cosmological model, we find the SPT cluster sample constrains σ_{8}(Ω_{m}/0.25)^{0.30} = 0.785±0.037. In combination with measurements of the cosmic microwave background (CMB) power spectrum from the SPT and the seven-year Wilkinson Microwave Anisotropy Probe data, the SPT cluster sample constrains σ_{8}= 0.795±0.016 and Ω_{m}= 0.255±0.016, a factor of 1.5 improvement on each parameter over the CMB data alone. We consider several extensions beyond the ΛCDM model by including the following as free parameters: the dark energy equation of state (w), the sum of the neutrino masses (Σm_{ν}), the effective number of relativistic species (N_{eff}), and a primordial non-Gaussianity (f_{NL}). We find that adding the SPT cluster data significantly improves the constraints on w and Σm_{ν} beyond those found when using measurements of the CMB, supernovae, baryon acoustic oscillations, and the Hubble constant. Considering each extension independently, we best constrain w = -0.973 ± 0.063 and the sum of neutrino masses Σm_{ν}< 0.28 eV at 95% confidence, a factor of 1.25 and 1.4 improvement, respectively, over the constraints without clusters. Assuming a ΛCDM model with a free N_{eff} and Σm _{ν}, we measure N_{eff}= 3.91±0.42 and constrain Σm_{ν}< 0.63 eV at 95% confidence. We also use the SPT cluster sample to constrain f_{NL}= -220±317, consistent with zero primordial non-Gaussianity. Finally, we discuss the current systematic limitations due to the cluster mass calibration, and future improvements for the recently completed 2500 deg^{2} SPT-SZ survey. The survey has detected ∼500 clusters with a median redshift of ∼0.5 and a median mass of ∼2.3x10^{14} M_{☉} h^{–1} and, when combined with an improved cluster mass calibration and existing external cosmological data sets will significantly improve constraints on w.

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Abstract Copyright:
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Journal keyword(s):
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cosmic background radiation - cosmology: observations - galaxies: clusters: general - large-scale structure of universe
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19

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2020.04.08-18:07:17

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