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Nature 457, 388-389 (22 January 2009) | doi:10.1038/457388a; Published online 21 January 2009
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Astrophysics: Galaxies in from the cold
Reinhard Genzel1
Abstract
Computer simulations of the cosmos suggest that cold streams of gas could underlie the unexpectedly high star-formation activity of many massive galaxies found to exist a few billion years after the Big Bang.
Recent surveys of galaxies1 have found evidence that galaxies with masses comparable to or greater than that of the Milky Way were already present in large numbers about 3 billion years after the Big Bang. What's more, a significant fraction of these massive galaxies seem to have been gas-rich, rotating disks in which stars formed at a rate of up to 150 solar masses per year, 50 times the rate in the present-day Milky Way2, 3.
- Reinhard Genzel is at the Max Planck Institute for Extraterrestrial Physics, 85748 Garching, Germany, and in the Department of Physics, University of California, Berkeley, USA.
Email: genzel@mpe.mpg.de
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RESEARCH
Cold streams in early massive hot haloes as the main mode of galaxy formationNature Letters to Editor (22 Jan 2009)
The rapid formation of a large rotating disk galaxy three billion years after the Big BangNature Letters to Editor (17 Aug 2006)
