The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)

Böhringer, H.; Chon, G.; Collins, Chris

doi:10.1051/0004-6361/201323155

Cited by 102 publications

(146 citation statements)

References 91 publications

Supporting

Mentioning

123

Contrasting

Unclassified

Order By: Relevance

“…2 Bocquet et al 2015). In a study of the REFLEX X-ray luminosity function, Böhringer et al (2014) also report general agreement with our cluster findings. On the other hand, Mantz et al (2015) find that their X-ray cluster counts, when using the WtG mass calibration, match the primary CMB constraints.…”

Section: Summary and Discussionsupporting

confidence: 89%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

604

156

View full text Add to dashboard Cite

We present cluster counts and corresponding cosmological constraints from the Planck full mission data set. Our catalogue consists of 439 clusters detected via their Sunyaev-Zeldovich (SZ) signal down to a signal-to-noise ratio of 6, and is more than a factor of 2 larger than the 2013 Planck cluster cosmology sample. The counts are consistent with those from 2013 and yield compatible constraints under the same modelling assumptions. Taking advantage of the larger catalogue, we extend our analysis to the two-dimensional distribution in redshift and signal-to-noise. We use mass estimates from two recent studies of gravitational lensing of background galaxies by Planck clusters to provide priors on the hydrostatic bias parameter, (1 − b). In addition, we use lensing of cosmic microwave background (CMB) temperature fluctuations by Planck clusters as an independent constraint on this parameter. These various calibrations imply constraints on the present-day amplitude of matter fluctuations in varying degrees of tension with those from the Planck analysis of primary fluctuations in the CMB; for the lowest estimated values of (1 − b) the tension is mild, only a little over one standard deviation, while it remains substantial (3.7σ) for the largest estimated value. We also examine constraints on extensions to the base flat ΛCDM model by combining the cluster and CMB constraints. The combination appears to favour non-minimal neutrino masses, but this possibility does little to relieve the overall tension because it simultaneously lowers the implied value of the Hubble parameter, thereby exacerbating the discrepancy with most current astrophysical estimates. Improving the precision of cluster mass calibrations from the current 10%-level to 1% would significantly strengthen these combined analyses and provide a stringent test of the base ΛCDM model.

show abstract

Section: Summary and Discussionsupporting

confidence: 89%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

604

156

View full text Add to dashboard Cite

show abstract

“…The volume fraction of superclusters in this sample was determined to be two per cent, while slightly more than half of the clusters belong to superclusters. The X-ray luminosity limit of the VLS is 5 × 10 43 erg s −1 , approximately comparable to a mass limit of 2 × 10 14 h −1 M below redshift z = 0.1 for the scaling relation in Böhringer et al (2014). Considering this limiting mass of the VLS, we find that the corresponding volume fraction of the simulation is 3.4 per cent.…”

Section: Volume Fractionsupporting

confidence: 58%

Characterising superclusters with the galaxy cluster distribution

Chon

Böhringer

Collins

et al. 2014

A&A

Self Cite

View full text Add to dashboard Cite

Superclusters are the largest observed matter density structures in the Universe. Recently, we presented the first supercluster catalogue constructed with a well-defined selection function based on the X-ray flux-limited cluster survey, REFLEX II. To construct the sample we proposed a concept to find large objects with a minimum overdensity such that it can be expected that most of their mass will collapse in the future. The main goal is to provide support for our concept here by using simulation that we can, on the basis of our observational sample of X-ray clusters, construct a supercluster sample defined by a certain minimum overdensity. On this sample we also test how superclusters trace the underlying dark matter distribution. Our results confirm that an overdensity in the number of clusters is tightly correlated with an overdensity of the dark matter distribution. This enables us to define superclusters within which most of the mass will collapse in the future. We also obtain first-order mass estimates of superclusters on the basis of the properties of the member clusters. We also show that in this context the ratio of the cluster number density and dark matter mass density is consistent with the theoretically expected cluster bias. Our previous work provided evidence that superclusters are a special environment in which the density structures of the dark matter grow differently from those in the field, as characterised by the X-ray luminosity function. Here we confirm for the first time that this originates from a top-heavy mass function at high statistical significance that is provided by a Kolmogorov-Smirnov test. We also find in close agreement with observations that the superclusters only occupy a small volume of a few per cent, but contain more than half of the clusters in the present-day Universe.

show abstract

“…the corresponding values of Ω m 0.25 and σ 8 0.80 [2] are marginally consistent with the 2σ allowed contours by the Planck cluster mass scale [26] and the extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II) [27]. For smaller values of f X and or Γ X the values of Ω m and σ 8 move closer to the base ΛCDM model [2].…”

Section: +0043supporting

confidence: 60%

Erratum: IceCube neutrinos, decaying dark matter, and the Hubble constant [Phys. Rev. D92, 061301(R) (2015)]

Anchordoqui¹,

Barger²,

Goldberg³

et al. 2016

Phys. Rev. D

View full text Add to dashboard Cite

Cosmological parameters deduced from the Planck measurements of anisotropies in the cosmic microwave background are at some tension with direct astronomical measurements of various parameters at low redshifts. Very recently, it has been conjectured that this discrepancy can be reconciled if a certain fraction of dark matter is unstable and decays between recombination and the present epoch. Herein we show that if the superheavy relics have a branching into neutrinos BX→νν ∼ 3 × 10 −9 , then this scenario can also accommodate the recently discovered extraterrestrial flux of neutrinos, relaxing the tension between IceCube results and Fermi LAT data. The model is fully predictive and can be confronted with future IceCube data. We demonstrate that in 10 years of observation IceCube will be able to distinguish the mono-energetic signal from X decay at the 3σ level. In a few years of data taking with the upgraded IceCube-Gen2 enough statistics will be gathered to elucidate the dark matter-neutrino connection at the 5σ level.

show abstract

The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)

Cited by 102 publications

References 91 publications

Planck2015 results

Planck2015 results

Characterising superclusters with the galaxy cluster distribution

Erratum: IceCube neutrinos, decaying dark matter, and the Hubble constant [Phys. Rev. D92, 061301(R) (2015)]

Contact Info

Product

Resources

About