Direct evidence for an early reionization of the Universe?

(2) STScI; (3) NOAO/Tucson; (4) JPL); B. Mobasher (1); D. Stern (4); H.C. Ferguson (2); M. Dickinson (3); M. Giavalisco (2); N. Panagia (1); S.M. Fall (2)

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Direct evidence for an early reionization of the Universe?

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arxiv astro-ph/0509605 v1 pith:DIZPB2BD submitted 2005-09-20 astro-ph

N. Panagia (1) , S.M. Fall (2) , B. Mobasher (1) , M. Dickinson (3) , H.C. Ferguson (2) , M. Giavalisco (2) , D. Stern (4) , T. Wiklind (1) ((1) ESA/STScI

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(2) STScI (3) NOAO/Tucson (4) JPL)

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keywords hudf-jd2deepredshiftreionizationuniverseapproxcapabledirect

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abstract

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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