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Revisiting GW170817 at Milliarcsecond Scale: High-precision Constraints on Jet Geometry and H0

  • Authors: Kelly Gourdji, Adam T. Deller, Chris Flynn, Taya Govreen-Segal, Cullan Howlett, Kunal P. Mooley, Ehud Nakar

Kelly Gourdji et al 2026 The Astrophysical Journal 1005 .

  • Provider: AAS Journals

Caption: Figure 4.

The 68% credible interval of our most informed measurement of H0 (65.5 ± 4.4 km s−1 Mpc−1) compared to those from a selection of relevant previous works using GW170817, as discussed in Section 4.3. Our measurement is obtained by combining posterior samples across 28 combinations of galaxy group catalog and peculiar velocity reconstruction and weighting them by the Bayes evidence of their respective fit (i.e., Bayesian model averaging). The 1σ extent of two independent H0 experiments, A. G. Riess et al. (2022) and Planck Collaboration et al. (2020), which are in tension with one another, are included for reference.

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