articleJournal of Cosmology and Astroparticle PhysicsAug 1, 2012GREEN OA

Improved constraints on the expansion rate of the Universe up to z ∼ 1.1 from the spectroscopic evolution of cosmic chronometers

MMM. MorescoACA. CimattiRJR. JimenezLPL. PozzettiGZG. Zamorani

Osservatorio astronomico di Bologna · University of Bologna · +41 more institutions

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Abstract

We present new improved constraints on the Hubble parameter H ( z ) in the redshift range 0.15 < z < 1.1, obtained from the differential spectroscopic evolution of early-type galaxies as a function of redshift. We extract a large sample of early-type galaxies ( ∼ 11000) from several spectroscopic surveys, spanning almost 8 billion years of cosmic lookback time (0.15 < z < 1.42). We select the most massive, red elliptical galaxies, passively evolving and without signature of ongoing star formation. Those galaxies can be used as standard cosmic chronometers, as firstly proposed by Jimenez & Loeb (2002), whose differential age evolution as a function of cosmic time directly probes H ( z ). We…

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Authors

68
  • MM
    M. MorescoCorresponding

    Osservatorio astronomico di Bologna, University of Bologna

  • AC
    A. Cimatti

    Osservatorio astronomico di Bologna, University of Bologna

  • RJ
    R. Jimenez

    Institució Catalana de Recerca i Estudis Avançats, Institut d'Estudis Espacials de Catalunya, Universitat de Barcelona

  • LP
    L. Pozzetti

    Osservatorio astronomico di Bologna

  • GZ
    G. Zamorani

    Osservatorio astronomico di Bologna

Topics & keywords

Topics
Keywords
  • Redshift
  • Galaxy
  • Hubble's law
  • Metric expansion of space
  • COSMIC cancer database
  • Hubble volume
  • Cosmology
  • Physical cosmology
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