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The Megamaser Cosmology Project. XIII. Combined Hubble Constant Constraints

Pesce, D. W. ; Braatz, J. A. ; Reid, M. J. ; Riess, A. G. ; Scolnic, D. ; Condon, J. J. ; Gao, F. ; Henkel, C. ; Impellizzeri, C. M. V. ; Kuo, C. Y. ; Lo, K. Y.

Astrophysical journal. Letters, 2020-03, Vol.891 (1), p.L1 [Periódico revisado por pares]

The American Astronomical Society

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  • Título:
    The Megamaser Cosmology Project. XIII. Combined Hubble Constant Constraints
  • Autor: Pesce, D. W. ; Braatz, J. A. ; Reid, M. J. ; Riess, A. G. ; Scolnic, D. ; Condon, J. J. ; Gao, F. ; Henkel, C. ; Impellizzeri, C. M. V. ; Kuo, C. Y. ; Lo, K. Y.
  • Assuntos: Hubble constant ; Megamasers ; Observational cosmology ; Very long baseline interferometry ; Water masers
  • É parte de: Astrophysical journal. Letters, 2020-03, Vol.891 (1), p.L1
  • Notas: AAS22552
  • Descrição: We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser data and obtained better distance estimates for four galaxies previously published by the Megamaser Cosmology Project: UGC 3789, NGC 6264, NGC 6323, and NGC 5765b. Combining these updated distance measurements with those for the maser galaxies CGCG 074-064 and NGC 4258, and assuming a fixed velocity uncertainty of 250 km s−1 associated with peculiar motions, we constrain the Hubble constant to be H0 = 73.9 3.0 km s−1 Mpc−1 independent of distance ladders and the cosmic microwave background. This best value relies solely on maser-based distance and velocity measurements, and it does not use any peculiar velocity corrections. Different approaches for correcting peculiar velocities do not modify H0 by more than 1 , with the full range of best-fit Hubble constant values spanning 71.8-76.9 km s−1 Mpc−1. We corroborate prior indications that the local value of H0 exceeds the early-universe value, with a confidence level varying from 95% to 99% for different treatments of the peculiar velocities.
  • Editor: The American Astronomical Society
  • Idioma: Inglês
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