Direct evidence for an early reionization of the Universe?

Details Direct evidence for an early reionization of the Universe? Direct evidence for an early reionization of the Universe?

2005-09-20

arxiv.org/abs/astro-ph/0509605v1

Astrophys.J.633:L1-L4,2005

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. Accepted for publication in ApJ Letters

Scientific paper

10.1086/498094

We examine the possible reionization of the intergalactic medium (IGM) by the source UDF033238.7-274839.8 (hereafter HUDF-JD2), which was discovered in deep {\it HST}/VLT/{\it Spitzer} images obtained as part of the Great Observatory Origins Deep Survey and {\it Hubble} Ultra-Deep Field projects. Mobasher et al (2005) have identified HUDF-JD2 as a massive ($\sim6\times10^{11}M_\odot$) post-starburst galaxy at redshift z$\gtrsim6.5$. We find that HUDF-JD2 may be capable of reionizing its surrounding region of the Universe, starting the process at a redshift as high as z$\approx 15 \pm5$.

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