articleThe Astrophysical JournalJul 20, 2016BRONZE OA

A 2.4% DETERMINATION OF THE LOCAL VALUE OF THE HUBBLE CONSTANT *

AGAdam G. RiessLMLucas M. MacriSLSamantha L. HoffmannDSDan ScolnicSCStefano Casertano

Space Telescope Science Institute · Johns Hopkins University · +12 more institutions

Indexed inarxivcrossrefdoaj

Abstract

ABSTRACT We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%. The bulk of this improvement comes from new near-infrared (NIR) observations of Cepheid variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), more than doubling the sample of reliable SNe Ia having a Cepheid-calibrated distance to a total of 19; these in turn leverage the magnitude-redshift relation based on ∼300 SNe Ia at z < 0.15. All 19 hosts as well as the megamaser system NGC 4258 have been observed with WFC3 in the optical and NIR, thus nullifying cross-instrument zeropoint errors in the relative distance estimates from…

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Authors

15
  • AG
    Adam G. RiessCorresponding

    Space Telescope Science Institute, Johns Hopkins University, Johns Hopkins Medicine, University of Baltimore

  • LM
    Lucas M. Macri

    Mitchell Institute, Texas A&M University

  • SL
    Samantha L. Hoffmann

    Mitchell Institute, Texas A&M University

  • DS
    Dan Scolnic

    Johns Hopkins University, Johns Hopkins Medicine, University of Chicago, University of Baltimore

  • SC
    Stefano Casertano

    Space Telescope Science Institute

Topics & keywords

Topics
Keywords
  • Cepheid variable
  • Hubble's law
  • Cosmic distance ladder
  • Milky Way
  • Large Magellanic Cloud
  • Megamaser
  • Galaxy
  • Wide Field Camera 3
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