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.; Abbott, T. M. C.; Allam, S.; Annis, J.; Asorey, J.; Avila, S.; Bechtol, K.; Brooks, D.; Brown, P.; Burke, D. L.; Calcino, J.; Carnero Rosell, A.; Carollo, D.; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Collett, T.; Crocce, M.; Cunha, C. E.; da Costa, L. N.; Davis, C.; De Vicente, J.; Diehl, H. T.; Doel, P.; Drlica-Wagner, A.; Eifler, T. F.; Estrada, J.; Evrard, A. E.; Filippenko, A. V.; Finley, D. A.; Flaugher, B.; Foley, R. J.; Fosalba, P.; Frieman, J.; Galbany, L.; Garcia-Bellido, J.; Gaztanaga, E.; Glazebrook, K.; Gonzalez-Gaitan, S.; Grün, D.; Gründl, R. A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Hollowood, D. L.; Honscheid, K.; Hoormann, J. K.; Hoyle, B.; Huterer, D.; Jain, B.; James, D. J.; Jeltema, T.; Kasai, E.; Krause, E.; Kühn, K.; Kuropatkin, N.; Lahav, O.; Lewis, G. F.; Li, T. S.; Lima, M.; Lin, H.; Maia, M. A. G.; Marshall, J. L.; Martini, P.; Miquel, R.; Nugent, P.; Palmese, A.; Pan, Y. -C.; Plazas, A. A.; Romer, A. K.; Roodman, A.; Sanchez, E.; Scarpine, V.; Schindler, R.; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, I.; Sharp, R.; Soares-Santos, M.; Sobreira, F.; Sommer, N. E.; Suchyta, E.; Swann, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; Thomas, R. C.; Tucker, B. E.; Uddin, S. A.; Vikram, V.; Walker, A. R. and Wiseman, P. (2019): First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant. In: Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 2: pp. 2184-2196

Abstract

We present an improved measurement of the Hubble constant (H-0) 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 H-0 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 H-0 = 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 H-0 value is consistent with estimates derived from the Cosmic Microwave Background assuming a Lambda CDM universe.

• Item Type: Journal article
• Faculties: Physics
• Subjects: 500 Science > 530 Physics
• ISSN: 0035-8711
• Language: English