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2 results

  • 6 - Galaxy Mapping Attempt at Tartu Observatory

  • Laird A. Thompson, University of Illinois, Urbana-Champaign
  • Book:
    The Discovery of Cosmic Voids
    Published online:
    02 December 2020
    Print publication:
    10 December 2020, pp 117-133

  • Summary

    Jaan Einasto at first investigated the structure of nearby galaxies and helped to deduce that they are dominated by dark matter. Joeveer at first studied the distribution and dynamics of stars in our Milky Way galaxy. In a joint effort in the mid-1970s, they investigated the galaxy distribution using catalogued data and began to see evidence for large-scale inhomogeneities. A careful review of their investigation reveals shortcomings. The Tartu Observatory 1.5-m telescope was built and commissioned in this era, but it was not equipped with a spectrograph capable of detecting galaxy redshifts. The greatest advantage held by the Estonians came from their early knowledge of computer simulations by Shandarin based on the Zeldovich approximation. At IAU Symposium No. 79 organized by the Estonian astronomers, the first open discussion was held of cosmic voids. Also participating in the meeting was Brent Tully, an expert on the structure of the Local supercluster.

  • 3-D Voronoi's Tessellation as a Tool for Identifying Galaxy Groups

  • Olga V. Melnyk, Andrii A. Elyiv, Iryna B. Vavilova
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue S235 / August 2006
    Published online by Cambridge University Press:
    01 August 2006, p. 223
    Print publication:
    August 2006
    • Article
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  • 3-D Voronoi's tessellation method has been applied for identifying groups of galaxies in the structure of the Local Supercluster and evaluation of its properties.