Determining the Hubble constant using giant extragalactic H ii regions and H ii galaxies

Authors

  • Ricardo Chávez,

    Corresponding author
    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, AP 51 y 216, 72000, Puebla, Mexico
      E-mail: et@ast.cam.ac.uk
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  • Elena Terlevich,

    Corresponding author
    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, AP 51 y 216, 72000, Puebla, Mexico
      Visiting Professor UAM, Madrid.
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  • Roberto Terlevich,

    Corresponding author
    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, AP 51 y 216, 72000, Puebla, Mexico
    2. Institute of Astronomy, University of Cambridge, Madingley Rd, CB3 OHA, Cambridge
      Visiting Professor UAM, Madrid.
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  • Manolis Plionis,

    1. Instituto Nacional de Astrofísica, Óptica y Electrónica, AP 51 y 216, 72000, Puebla, Mexico
    2. Institute of Astronomy & Astrophysics, National Observatory of Athens, Thessio, 11810 Athens, Greece
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  • Fabio Bresolin,

    1. Institute for Astronomy of the University of Hawaii, 2680 Woodlawn Drive, 96822 Honolulu, HI, USA
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  • Spyros Basilakos,

    1. Academy of Athens Research Center for Astronomy & Applied Mathematics, Soranou Efessiou 4, 11-527 Athens, Greece
    2. High Energy Physics Group, Department ECM, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
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  • Jorge Melnick

    1. European Southern Observatory, Alonso de Cordova 3107, Santiago de Chile 19, Chile
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E-mail: et@ast.cam.ac.uk

Visiting Professor UAM, Madrid.

ABSTRACT

We report the first results of a long-term programme aiming to provide accurate independent estimates of the Hubble constant (H0) using the L(Hβ)–σ distance estimator for giant extragalactic H ii regions (GEHR) and H ii galaxies.

We have used Very Large Telescope and Subaru high-dispersion spectroscopic observations of a local sample of H ii galaxies, identified in the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) catalogue in order to redefine and improve the L(Hβ)–σ distance indicator and to determine the Hubble constant. To this end, we utilized as local calibration or ‘anchor’ of this correlation GEHR in nearby galaxies which have accurate distance measurements determined via primary indicators. Using our best sample of 69 nearby H ii galaxies and 23 GEHR in nine galaxies, we obtain H0= 74.3 ± 3.1 (statistical) ± 2.9 (systematic) km s−1 Mpc−1, in excellent agreement with, and independently confirming, the most recent Type Ia supernovae based results.

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