A Probable z~7 Galaxy Strongly Lensed by the Rich Cluster Abell 2218: Exploring the Dark Ages

Details A Probable z~7 Galaxy Strongly Lensed by the Rich Cluster Abell 2218: Exploring the Dark Ages A Probable z~7 Galaxy Strongly Lensed by the Rich Cluster Abell 2218: Exploring the Dark Ages

2004-02-12

arxiv.org/abs/astro-ph/0402319v1

Astrophys.J.607:697-703,2004

Astronomy and Astrophysics

Astrophysics

20 pages, paper accepted by the Astrophysical Journal

Scientific paper

10.1086/386281

We discuss the observational properties of a remarkably faint triply-imaged galaxy revealed in a deep z-band ACS observation of the lensing cluster A2218. A well-constrained mass model for the cluster, which incorporates the outcome of recent Keck spectroscopic campaigns, suggests that the triple system arises via a z>6 source viewed at high magnification (~x25). Optical and IR photometry from HST and Keck confirms the lensing hypothesis and suggests a significant discontinuity occurs in the spectral energy distribution within 9250-9850A. If this break is associated with Gunn-Peterson absorption from neutral hydrogen,6.6

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