A More Accurate and Competitive Estimative of H0 in Intermediate Redshifts

2018/05/31 by G. Pordeus da Silva, A. G. Cavalcanti
Engineering · Physics and Astronomy · #Astronomy and Astrophysical Research #COSMIC cancer database #Cosmic background radiation #Cosmic microwave background #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble's law #Redshift #Sky #Space Technology and Applications #Systematic error #astro-ph.CO

paper · pdf · doi:10.1007/s13538-018-0581-9

published as G. Pordeus da Silva and A. G. Cavalcanti, Brazilian Journal of Physics48, 521 (2018) · 8 pages, 6 figures and 2 tables

openalex created_date 2018/06/01 · openalex publication_date 2018/06/20 · arxiv created 2019/05/31 · arxiv updated 2019/06/03 · openalex updated_date 2026/08/05

Abstract

In order to clarify the tension between estimates of the Hubble Constant (H₀) from local (z ≪ 1) and global (z ≫ 1) measurements, Lima and Cunha (LC) proposed a new method to measure H₀ in intermediate redshifts (z ≈ 1), which were obtained H₀ = 74.1 ± 2.2 km s^-1 Mpc^-1 (1 σ), in full agreement to local measurements via Supernovae/Cepheid dataset. However, Holanda et al. (2014) affirm that a better understanding of the morphology of galaxy clusters in LC framework is needed to a more robust and accurate determination of H₀. Moreover, that kind of sample has been strongly questioned in the literature. In this context, (i) we investigated if the sample of galaxy clusters used by LC has a relevant role in their results, then (ii) we perform a more accurate and competitive determination of H₀ in intermediate redshifts, free of unknown systematic uncertainties. First, we found that the exclusion of the sample of galaxy clusters from the determination initially proposed by LC leads to significantly different results. Finally, we performed a new determination in H₀, where we obtained H₀ = 68.00 ± 2.20 km s^-1 Mpc^-1 (1 σ) with statistical and systematic errors and H₀ = 68.71^+1.37_-1.45 km s^-1 Mpc^-1 (1 σ) with statistical errors only. Contrary to those obtained by LC, these values are in full harmony with the global measurements via Cosmic Microwave Background (CMB) radiation and to the other recent estimates of H₀ in intermediate redshifts.

Citations

• CAN OLD GALAXIES AT HIGH REDSHIFTS AND BARYON ACOUSTIC OSCILLATIONS CONSTRAIN H 0 ?
• NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
• Synthetic stellar populations: single stellar populations, stellar interior models and primordial protogalaxies
• Primeval Adiabatic Perturbation in an Expanding Universe
• A 3% SOLUTION: DETERMINATION OF THE HUBBLE CONSTANT WITH THEHUBBLE SPACE TELESCOPEAND WIDE FIELD CAMERA 3
• Planck2013 results. XVI. Cosmological parameters
• Measuring the Three‐dimensional Structure of Galaxy Clusters. I. Application to a Sample of 25 Clusters
• A gravitational-wave standard siren measurement of the Hubble constant