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Probing the Origins of Voids in the Distribution of Galaxies

Ord, Louise M. ; Kunz, Martin ; Mathis, Hugues ; Silk, Joseph

In: Publications of the Astronomical Society of Australia, 2005, vol. 22, no. 2, p. 166-173

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    Titre
    • Probing the Origins of Voids in the Distribution of Galaxies
    Auteur
    • Ord, Louise M.. Department of Astrophysics & Optics, School of Physics, University of New South Wales, Sydney NSW 2052, Australia
    • Kunz, Martin. Astronomy Centre, University of Sussex, Brighton BN1 9QJ, UK
    • Mathis, Hugues. Astrophysics, Denys Wilkinson Building, University of Oxford, Oxford OX1 3RH, UK
    • Silk, Joseph. Astrophysics, Denys Wilkinson Building, University of Oxford, Oxford OX1 3RH, UK
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Publications of the Astronomical Society of Australia, 2005, vol. 22, no. 2, p. 166-173. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:293983
    Summary
    If the voids that we see today in the distribution of galaxies existed at recombination, they will leave an imprint on the cosmic microwave background (CMB). On the other hand, if these voids formed much later, their effect on the CMB will be negligible and will not be observed with the current generation of experiments. In this paper, presented at the 2004 Annual Scientific Meeting of the Astronomical Society of Australia, we discuss our ongoing investigations into voids of primordial origin. We show that if voids in the cold dark matter distribution existed at the epoch of decoupling, they could contribute significantly to the apparent rise in CMB power on small scales detected by the Cosmic Background Imager (CBI) Deep Field. Here we present our improved method for predicting the effects of primordial voids on the CMB in which we treat a void as an external source in the cold dark matter (CDM) distribution employing a Boltzmann solver. Our improved predictions include the effects of a cosmological constant (Λ) and acoustic oscillations generated by voids at early times. We find that models with relatively large voids on the last scattering surface predict too much CMB power in an Einstein-de Sitter background cosmology but could be consistent with the current CMB observations in a ΛCDM universe