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Título

GRB 090423 at a redshift of z ≈ 8.1

Otros títulosGRB 090423 reveals an exploding star at the epoch of re-ionization
AutorSalvaterra, Rubén; Fernández-Soto, Alberto
Fecha de publicación29-oct-2009
EditorNature Publishing Group
CitaciónNature 461(7268): 1258-1260 (2009)
ResumenGamma-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.
Descripción3 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
Versión del editorhttp://dx.doi.org/10.1038/nature08445
URIhttp://hdl.handle.net/10261/18189
DOI10.1038/nature08445
ISSN0028-0836 (Print)
1476-4687 (Online)
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