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

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posted on 2023-06-09, 18:48 authored by E Macaulay, R C Nichol, D Bacon, D Brout, T M Davis, B Zhang, B A Bassett, D Scolnic, A Moller, C B D'Andrea, S R Hinton, R Kessler, A G Kim, J Lasker, C Lidman, M Sako, M Smith, M Sullivan, Kathy RomerKathy Romer, DES Collaboration, others
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 ?CDM universe.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

2

Volume

486

Page range

2184-2196

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-09-12

First Open Access (FOA) Date

2019-09-12

First Compliant Deposit (FCD) Date

2019-08-29

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