MacAulay, E;
Nichol, RC;
Bacon, D;
Brout, D;
Davis, TM;
Zhang, B;
Bassett, BA;
... Swann, E; + view all
(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.
10.1093/mnras/stz978.
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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.
| Type: | Article |
|---|---|
| Title: | First cosmological results using Type Ia supernovae from the Dark Energy Survey: Measurement of the Hubble constant |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz978 |
| Publisher version: | https://doi.org/10.1093/mnras/stz978 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | cosmological parameters, cosmology: observations, distance scale |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10077553 |
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