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Open Access item GRB 090423 at a redshift of z ≈ 8.1

Other Titles:GRB 090423 reveals an exploding star at the epoch of re-ionization
Authors:Salvaterra, Ruben
Fernández-Soto, Alberto
Issue Date:29-Oct-2009
Publisher:Nature Publishing Group
Citation:Nature 461(7268): 1258-1260 (2009)
Abstract:Gamma-ray bursts (GRBs) are produced by rare types of massive stellar explosion. Their rapidly fading afterglows are often bright enough at optical wavelengths that they are detectable at cosmological distances. Hitherto, the highest known redshift for a GRB was z = 6.7 (ref. 1), for GRB 080913, and for a galaxy was z = 6.96 (ref. 2). Here we report observations of GRB 090423 and the near-infrared spectroscopic measurement of its redshift, z = 8.1(+0.1)(-0.3). This burst happened when the Universe was only about 4 per cent of its current age. Its properties are similar to those of GRBs observed at low/intermediate redshifts, suggesting that the mechanisms and progenitors that gave rise to this burst about 600,000,000 years after the Big Bang are not markedly different from those producing GRBs about 10,000,000,000 years later.
Description:3 pages, 2 figures.-- ArXiv pre-print available at: http://arxiv.org/abs/0906.1578.-- et al.
Supporting information available at: http://www.nature.com/nature/journal/v461/n7268/suppinfo/nature08445.html
Publisher version (URL):http://dx.doi.org/10.1038/nature08445
URI:http://hdl.handle.net/10261/18189
ISSN:0028-0836 (Print)
1476-4687 (Online)
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Appears in Collections:(IFCA) Artículos

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