Cluster counts: calibration issue or new physics?

0502098 - FZÚ 2019 RIV FR eng J - Journal Article
Sakr, Z. - Ilić, Stephane - Blanchard, A. - Bittar, J. - Farah, W.
Cluster counts: calibration issue or new physics?
Astronomy & Astrophysics. Roč. 620, Nov (2018), s. 1-2, č. článku A78. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : galaxies: clusters: general * large-scale structure of Universe * cosmological parameters * cosmic background radiation
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.209, year: 2018

In recent years, the amplitude of matter fluctuations inferred from low-redshift probes has been found to be generally lower than the value derived from cosmic microwave background (CMB) observations in the ΛCDM model. This tension has been exemplified by Sunyaev-Zel’dovich and X-ray cluster counts which, when using their Planck standard cluster mass calibration, yield a value of σ8, appreciably lower than estimations based on the latest Planck CMB measurements. In this work we examine whether non-minimal neutrino masses can alleviate this tension substantially. We used the cluster X-ray temperature distribution function derived from a flux-limited sample of local X-ray clusters, combined with Planck CMB measurements. These datasets were compared to ΛCDM predictions based on recent mass function, adapted to account for the effects of massive neutrinos.
Permanent Link: http://hdl.handle.net/11104/0294039