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2019•Monthly Notices of the Royal Astronomical SocietyOpen access

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

E. Macaulay, R. C. Nichol, David Bacon, Dillon Brout, T. M. Davis, B Zhang, Bruce A. Bassett, D. Scolnic, A. Möller, C. B. D’Andrea, S. R. Hinton, R Kessler, Alex Kim, J. Lasker, C. Lidman, M. Šako, M. Smith, M. Sullivan, T. M. C. Abbott, S. Allam, J. Annis, J. Asorey, S. Àvila, K. Bechtol, D. Brooks, P. J. Brown, D. L. Burke, Josh Calcino, A. Carnero Rosell, D. Carollo, M. Carrasco Kind, J. Carretero, F. J. Castander, Thomas E. Collett, M. Crocce, C. E. Cunha, L. N. da Costa, C. Davis, J. De Vicente, H. T. Diehl, P. Doel, A. Drlica-Wagner, T. F. Eifler, Juan Estrada, A. E. Evrard, A. V. Filippenko, D. A. Finley, B. Flaugher, R. J. Foley, P. Fosalba, J. Frieman, L. Galbany, J. García-Bellido, E. Gaztañaga, Karl Glazebrook, S. González–Gaitán, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutiérrez, W. G. Hartley, D L Hollowood, K. Honscheid, J. K. Hoormann, B. Hoyle, Dragan Huterer, Bhuvnesh Jain, D. J. James, T. Jeltema, E. Kasai, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, Geraint F. Lewis, T S Li, M. Lima, H. Lin, M. A. G. Maia, J. L. Marshall, Paul Martini, R. Miquel, P. Nugent, A. Palmese, Y-C Pan, A A Plazas, A. K. Romer, A. Roodman, E. Sánchez, V. Scarpine, R. Schindler, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, R. Sharp, M. Soares-Santos, F. Sobreira, N. E. Sommer, E. Suchyta, Elizabeth Swann, M. E. C. Swanson, G. Tarlé, D. Thomas, R. C. Thomas, B. Tucker, S. A. Uddin, V. Vikram, A. R. Walker, P. Wiseman

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Abstract

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.

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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.

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Available abstract

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.

Key concepts: Physics, Dark energy, Hubble's law, Cosmic microwave background, Astrophysics, Redshift, Baryon acoustic oscillations, Cepheid variable

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