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How galaxies acquire their neutrino haloes

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Abstract

One-dimensional simulations of the nonlinear growth of structure in a universe dominated by a population of nonrelativistic collisionless particles such as massive neutrinos show that a subpopulation of slowly moving particles exists within the ‘pancakes’ that form1. These particles can cluster in a low velocity condensate around any seed perturbation which may be present. The schematic calculation of this aggregation presented here suggests that the properties of neutrino clusters depend only weakly on seed mass but substantially on seed separation. Their mass and velocity dispersion may be quite comparable with the values inferred for the haloes of ‘dark’ matter surrounding real galaxies.

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Authors and Affiliations

  1. Physics Department, Stanford University, Stanford, California, 94305, USA

    J. Richard Bond

  2. Astronomy Department, University of California, Berkeley, California, 94720, USA

    Alex S. Szalay & Simon D. M. White

Authors
  1. J. Richard Bond
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  2. Alex S. Szalay
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  3. Simon D. M. White
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Bond, J., Szalay, A. & White, S. How galaxies acquire their neutrino haloes. Nature 301, 584–585 (1983). https://doi.org/10.1038/301584a0

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  • DOI: https://doi.org/10.1038/301584a0

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