New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant

@article{Riess2018NewPO,
  title={New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant},
  author={Adam G. Riess and Stefano Casertano and Wenlong Yuan and Lucas M. Macri and Jay Anderson and John W. MacKenty and J. Bradley Bowers and Kelsey I. Clubb and Alexei V. Filippenko and David O. Jones and Brad E. Tucker},
  journal={The Astrophysical Journal},
  year={2018},
  volume={855}
}
We present new measurements of the parallax of seven long-period (≥10 days) Milky Way (MW) Cepheid variables (SS CMa, XY Car, VY Car, VX Per, WZ Sgr, X Pup, and S Vul) using one-dimensional astrometric measurements from spatial scanning of Wide-Field Camera 3 on the Hubble Space Telescope (HST). The observations were obtained at ∼6 month intervals over 4 years. The distances are 1.7–3.6 kpc, with a mean precision of 45 μas (signal-to-noise ratio (S/N) ≈ 10) and a best precision of 29 μas (S/N… 

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