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Nature 445, 37 (4 January 2007) | doi:10.1038/445037a; Published online 3 January 2007

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Cosmology: Ripples of early starlight

Craig J. Hogan1

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After all known sources are accounted for, puffy blobs of infrared light persist on deep-field telescope images. Evidence is mounting that these could be the signatures of stars in early 'protogalaxies'.

About a year ago, Kashlinsky et al. found evidence for fluctuations in background infrared light from far-off cosmological sources larger than would be expected from unresolved galaxies in known populations1, 2. In two papers to be published in The Astrophysical Journal, the same authors now confirm the effect in different and larger sections of the sky3, 4.

  1. Craig J. Hogan is in the Departments of Astronomy and of Physics, University of Washington, Box 351580, Seattle, Washington 98195-1580, USA.
    Email: hogan@u.washington.edu

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