Model-independent measurement of the Hubble Constant and the absolute magnitude of Type Ia Supernovae

2021/01/14 by Jian-Chen Zhang, Kang Jiao, Zhang, Jian-Chen +3
Physics and Astronomy · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.2101.05897

openalex publication_date 2021/01/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this work, we propose a cosmological model-independent and non-local method to constrain the Hubble Constant H₀. Inspired by the quasi cosmological model-independent and H₀-free properties of the `shifted' Hubble diagram of HII galaxies (HIIGx) defined by Wei et al. (2016), we joint analyze it with the parametric type Ia supernova (SN Ia) Hubble diagram (e.g. the joint-lightcurves-analysis sample, JLA) and get a Bayesian Inference of Hubble constant, H₀ = 71 ± 20 \mathrmkm s^-1 Mpc^-1. Although with large uncertainty, we find that H₀ is only strongly degenerate with the B-band absolute magnitude (M_B) of SN Ia but almost independent on other nuisance parameters. Therefore the accuracy can be simultaneously improved by a tight constraint of M_B through a cosmological and H₀ independent way. This method can be extended further to get more-literally non-local results of H₀ by using other Hubble diagrams at higher redshifts.

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