Letter | Published:

Velocity anti-correlation of diametrically opposed galaxy satellites in the low-redshift Universe

Nature volume 511, pages 563566 (31 July 2014) | Download Citation

Abstract

Recent work has shown that the Milky Way and the Andromeda galaxies both possess the unexpected property that their dwarf satellite galaxies are aligned in thin and kinematically coherent planar structures1,2,3,4,5,6,7. It is interesting to evaluate the incidence of such planar structures in the larger galactic population, because the Local Group may not be a representative environment. Here we report measurements of the velocities of pairs of diametrically opposed satellite galaxies. In the local Universe (redshift z < 0.05), we find that satellite pairs out to a distance of 150 kiloparsecs from the galactic centre are preferentially anti-correlated in their velocities (99.994 per cent confidence level), and that the distribution of galaxies in the larger-scale environment (out to distances of about 2 megaparsecs) is strongly clumped along the axis joining the inner satellite pair (>7σ confidence). This may indicate that planes of co-rotating satellites, similar to those seen around the Andromeda galaxy, are ubiquitous, and their coherent motion suggests that they represent a substantial repository of angular momentum on scales of about 100 kiloparsecs.

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Acknowledgements

Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society and the Higher Education Funding Council for England. The Millennium-II simulation databases used in this paper and the web application providing online access to them were constructed as part of the activities of the German Astrophysical Virtual Observatory.

Author information

Affiliations

  1. Lycée international des Pontonniers, 1 rue des Pontonniers, F-67000 Strasbourg, France

    • Neil G. Ibata
  2. Observatoire astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l’Université, F-67000 Strasbourg, France

    • Rodrigo A. Ibata
    •  & Benoit Famaey
  3. Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, New South Wales 2006, Australia

    • Geraint F. Lewis

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Contributions

All authors assisted in the development and writing of the paper. N.G.I. primarily contributed to the development of the test for planar alignments, and R.A.I. implemented this test on the SDSS galaxy catalogue.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Neil G. Ibata.

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https://doi.org/10.1038/nature13481

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