Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant

25 May 2018 Riess Adam G. Casertano Stefano Yuan Wenlong Macri Lucas Bucciarelli Beatrice Lattanzi Mario G. MacKenty John W. Bowers J. Bradley Zheng Weikang Filippenko Alexei V. Huang Caroline Anderson Richard I.

We present HST photometry of a selected sample of 50 long-period, low-extinction Milky Way Cepheids measured on the same WFC3 F555W, F814W, and F160W-band photometric system as extragalactic Cepheids in SN Ia hosts. These bright Cepheids were observed with the WFC3 spatial scanning mode in the optical and near-infrared to mitigate saturation and reduce pixel-to-pixel calibration errors to reach a mean photometric error of 5 millimags per observation... (read more)

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  • COSMOLOGY AND NONGALACTIC ASTROPHYSICS
  • SOLAR AND STELLAR ASTROPHYSICS