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

A. Dekel (), Y. Birnboim, G. Engel, J. Freundlich, T. Goerdt, M. Mumcuoglu, E. Neistein, C. Pichon, R. Teyssier and E. Zinger
Additional contact information
A. Dekel: Racah Institute of Physics, The Hebrew University
Y. Birnboim: Racah Institute of Physics, The Hebrew University
G. Engel: Racah Institute of Physics, The Hebrew University
J. Freundlich: Racah Institute of Physics, The Hebrew University
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
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
E. Zinger: Racah Institute of Physics, The Hebrew University

Nature, 2009, vol. 457, issue 7228, 451-454

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.

Date: 2009
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DOI: 10.1038/nature07648

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