Abstract We present recent JWST NIRCam imaging observations of SPT0615-JD (also known as the Cosmic Gems Arc), lensed by the galaxy cluster SPT-CL J0615−5746. The 5 ″ long arc is the most highly magnified z > 10 galaxy known. It straddles the lensing critical curve and reveals five star clusters with radii of ∼1 pc or less. We measure the full arc to have F200W 24.5 AB mag, consisting of two mirror images, each 25.3 AB mag with a median magnification of μ ∼ 6 0 − 8 + 17 (delensed 29.7 AB mag, M UV = −17.8). The galaxy has an extremely strong Lyman break F115W−F200W >3.2 mag (2 σ lower limit), is undetected in all bluer filters ( . ″ 2 of the predicted position, lensed to AB mag 28.4 and magnified by μ ∼ 2, suggesting the fold arc may only show ∼60% of the galaxy. SPT0615-JD is a unique laboratory to study star clusters observed within a galaxy just 460 Myr after the Big Bang.
Bradley et al. (Fri,) studied this question.
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