English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich(SZ) cluster survey in combination with X-ray measurements to constraincosmological parameters. We present a statistical method that fits for thescaling relations of the SZ and X-ray cluster observables with mass whilejointly fitting for cosmology. The method is generalizable to multiple clusterobservables, and self-consistently accounts for the effects of the clusterselection and uncertainties in cluster mass calibration on the derivedcosmological constraints. We apply this method to a data set consisting of anSZ-selected catalog of 18 galaxy clusters at z > 0.3 from the first 178 deg2 ofthe 2500 deg2 SPT-SZ survey, with 14 clusters having X-ray observations fromeither Chandra or XMM. Assuming a spatially flat LCDM cosmological model, wefind the SPT cluster sample constrain sigma_8 (Omega_m/0.25)^0.30 = 0.785 +-0.037. In combination with measurements of the CMB power spectrum from the SPTand the seven-year WMAP data, the SPT cluster sample constrain sigma_8 = 0.795+- 0.016 and Omega_m = 0.255 +- 0.016, a factor of 1.5 improvement on eachparameter over the CMB data alone. We consider several extensions beyond theLCDM model by including the following as free parameters: the dark energyequation of state (w), the sum of the neutrino masses (sum mnu), the effectivenumber of relativistic species (Neff), and a primordial non-Gaussianity (fNL).We find that adding the SPT cluster data significantly improves the constraintson w and sum mnu beyond those found when using measurements of the CMB,supernovae, baryon acoustic oscillations, and the Hubble constant. Consideringeach extension independently, we best constrain w=-0.973 +- 0.063 and the sumof neutrino masses sum mnu < 0.28 eV at 95% confidence, a factor of 1.25 and1.4 improvement, respectively, over the constraints without clusters. [abbrev.]

astrophysical journal/the astrophysical journal

Cosmological Constraints from Sunyaev-Zel'dovich-Selected Clusters with  X-ray Observations in the First 178 Square Degrees of the South Pole  Telescope Survey