Get access

Disc scalelengths out to redshift 5.8

Authors

  • K. Fathi,

    Corresponding author
    1. Stockholm Observatory, Department of Astronomy, Stockholm University, AlbaNova Centre, 106 91 Stockholm, Sweden
    2. Oskar Klein Centre for Cosmoparticle Physics, Stockholm University, 106 91 Stockholm, Sweden
    Search for more papers by this author
  • M. Gatchell,

    1. Stockholm Observatory, Department of Astronomy, Stockholm University, AlbaNova Centre, 106 91 Stockholm, Sweden
    2. Department of Physics, Stockholm University, AlbaNova Centre, 106 91 Stockholm, Sweden
    Search for more papers by this author
  • E. Hatziminaoglou,

    1. ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
    Search for more papers by this author
  • B. Epinat

    1. Institut de Recherche en Astrophysique et Planetologie, Universite de Toulouse, CNRS, 14 avenue Edouard Belin, 31400 Toulouse, France
    2. Laboratoire dAstrophysique de Marseille, Universite de Provence, CNRS, 38 rue Frederic Joliot-Curie, F-13388 Marseille Cedex 13, France
    Search for more papers by this author

E-mail: kambiz@astro.su.se

ABSTRACT

We compute the exponential disc scalelength for 686 disc galaxies with spectroscopic redshifts out to redshift 5.8 based on Hubble Space Telescope archival data. We compare the results with our previous measurements based on 30 000 nearby galaxies from the Sloan Digital Sky Survey. Our results confirm the presence of a dominating exponential component in galaxies out to this redshift. At the highest redshifts, the disc scalelength for the brightest galaxies with absolute magnitude between −24 and −22 is up to a factor of 8 smaller compared to that in the local Universe. This observed scalelength decrease is significantly greater than the value predicted by a cosmological picture in which baryonic disc scalelength scales with the virial radius of the dark matter halo.

Ancillary