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

First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant
First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant
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% 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.
0035-8711
Macaulay, E
55264b3c-6266-43c7-8617-8668942c8190
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Wiseman, Philip
865f95f8-2200-46a8-bd5e-3ee30bb44072
The DES Collaboration
Macaulay, E
55264b3c-6266-43c7-8617-8668942c8190
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Wiseman, Philip
865f95f8-2200-46a8-bd5e-3ee30bb44072

Macaulay, E, Smith, Mathew, Sullivan, Mark and Wiseman, Philip , The DES Collaboration (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. (In Press)

Record type: Article

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% 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.

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DES_SN_H_0_paper_accepted - Accepted Manuscript
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Accepted/In Press date: 8 April 2019

Identifiers

Local EPrints ID: 430278
URI: https://eprints.soton.ac.uk/id/eprint/430278
ISSN: 0035-8711
PURE UUID: 1c192f62-7d94-4e5f-b1c4-02d0b6344a7a
ORCID for Mathew Smith: ORCID iD orcid.org/0000-0002-3321-1432
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 24 Apr 2019 16:30
Last modified: 17 May 2019 00:30

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Contributors

Author: E Macaulay
Author: Mathew Smith ORCID iD
Author: Mark Sullivan ORCID iD
Author: Philip Wiseman

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