First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant

Macaulay, E, Nichol, R C, Bacon, D, Brout, D, Davis, T M, Zhang, B, Bassett, B A, Scolnic, D, Moller, A, D'Andrea, C B, Hinton, S R, Kessler, R, Kim, A G, Lasker, J, Lidman, C, Sako, M, Smith, M, Sullivan, M, Romer, A K, DES Collaboration, and others, (2019) First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant. Monthly Notices of the Royal Astronomical Society, 486 (2). pp. 2184-2196. ISSN 0035-8711

[img] PDF - Published Version
Available under License All Rights Reserved.

Download (4MB)

Abstract

We present an improved measurement of the Hubble constant (H0) using the `inverse distance ladder' method, which adds the information from 207 Type Ia supernovae (SNe Ia) from the Dark Energy Survey (DES) at redshift 0.018 < z < 0.85 to existing distance measurements of 122 low-redshift (z < 0.07) SNe Ia (Low-z) and measurements of Baryon Acoustic Oscillations (BAOs). Whereas traditional measurements of H0 with SNe Ia use a distance ladder of parallax and Cepheid variable stars, the inverse distance ladder relies on absolute distance measurements from the BAOs to calibrate the intrinsic magnitude of the SNe Ia. We find H0 = 67.8 ± 1.3 km s-1 Mpc-1 (statistical and systematic uncertainties, 68 per cent confidence). Our measurement makes minimal assumptions about the underlying cosmological model, and our analysis was blinded to reduce confirmation bias. We examine possible systematic uncertainties and all are below the statistical uncertainties. Our H0 value is consistent with estimates derived from the Cosmic Microwave Background assuming a ΛCDM universe.

Item Type: Article
Keywords: cosmological parameters, cosmology: observations, distance scale
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 12 Sep 2019 12:20
Last Modified: 12 Sep 2019 12:20
URI: http://sro.sussex.ac.uk/id/eprint/85741

View download statistics for this item

📧 Request an update