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Cold streams in early massive hot haloes as the main mode of galaxy formation

Author

Listed:
  • A. Dekel

    (Racah Institute of Physics, The Hebrew University)

  • Y. Birnboim

    (Racah Institute of Physics, The Hebrew University
    Harvard Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, Massachusetts 02138, USA)

  • G. Engel

    (Racah Institute of Physics, The Hebrew University)

  • J. Freundlich

    (Racah Institute of Physics, The Hebrew University
    Departement de Physique, ENS, 24 rue Lhomond, 75231 Paris cedex 05, France)

  • T. Goerdt

    (Racah Institute of Physics, The Hebrew University)

  • M. Mumcuoglu

    (Racah Institute of Physics, The Hebrew University)

  • E. Neistein

    (Racah Institute of Physics, The Hebrew University
    Max Planck Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany)

  • C. Pichon

    (Institut d’Astrophysique de Paris and UPMC, 98bis Boulevard Arago, Paris 75014, France)

  • R. Teyssier

    (CEA Saclay, DSM/IRFU, UMR AIM, Batiment 709, 91191 Gif-sur-Yvette cedex, France
    Institute for Theoretical Physics, University of Zurich)

  • E. Zinger

    (Racah Institute of Physics, The Hebrew University)

Abstract

Early star formation: steady progress Recent observations suggest that the massive galaxies that were at the height of their star-forming activity in the young Universe ten billion years ago formed their stars at surprisingly high rates. While such rates are commonly attributed to violent galaxy mergers, many of these galaxies are rotating discs, as extended as today's Milky Way, a structure that is incompatible with such a history. A new cosmological simulation suggests that these galaxies were 'stream fed', acquiring the material that was needed to fuel star formation as a steady flow of cold gas from the extended dark-matter haloes surrounding the galaxies. It is the rarer submillimetre galaxies, which form stars even more intensely, that are largely merger-induced starbursts.

Suggested Citation

  • A. Dekel & Y. Birnboim & G. Engel & J. Freundlich & T. Goerdt & M. Mumcuoglu & E. Neistein & C. Pichon & R. Teyssier & E. Zinger, 2009. "Cold streams in early massive hot haloes as the main mode of galaxy formation," Nature, Nature, vol. 457(7228), pages 451-454, January.
    • Handle: RePEc:nat:nature:v:457:y:2009:i:7228:d:10.1038_nature07648
    DOI: 10.1038/nature07648
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