Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-17
Astronomy and Astrophysics
Astrophysics
11 pages, 3 figures, to appear in Ap J Lett, minor revision following referee's report
Scientific paper
10.1086/324423
We discuss the physical nature of a remarkably faint pair of Lyman alpha-emitting images discovered close to the giant cD galaxy in the lensing cluster Abell 2218 (z=0.18) during a systematic survey for highly-magnified star-forming galaxies beyond z=5. A well-constrained mass model suggests the pair arises via a gravitationally-lensed source viewed at high magnification. Keck spectroscopy confirms the lensing hypothesis and implies the unlensed source is a very faint (I~30) compact (<150 pc) and isolated object at z=5.576 whose optical emission is substantially contained within the Lyman alpha emission line; no stellar continuum is detectable. The available data suggest the source is a promising candidate for an isolated ~10^6 solar mass system seen producing its first generation of stars close to the epoch of reionization.
Ellis Richard
Kneib Jean Paul
Kuijken Konrad
Santos Marcelo M.
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