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Universe Today features SKYCR director’s discovery of a gravitational arc in JWST data

The international astronomy outlet Universe Today has published a feature on a discovery by SKYCR director Homer Dávila Gutiérrez: a previously uncatalogued gravitational arc candidate, A1, in the massive galaxy cluster MACS J0308.9+2645, identified from publicly available JWST NIRCam data. Found among 1,591 candidates across 54 public fields, A1 is best interpreted as a galaxy at redshift ~1.4, stretched and magnified by the cluster's gravity — a discovery hiding in Webb's public archive, with the definitive lens-model test still in progress.

SKYCR Web Team
By SKYCR Web Team
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An international team of astronomers have used the NASA/ESA/CSA James Webb Space Telescope to discover gravitationally bound star clusters when the Universe was 460 million years old. This is the first discovery of star clusters in an infant galaxy less than 500 million years after the Big bang. Young galaxies in the early Universe underwent significant burst phases of star formation, generating substantial amounts of ionising radiation. However, because of their cosmological distances, direct studies of their stellar content have proven challenging. Using Webb, an international team of astronomers have now detected five young massive star clusters in the Cosmic Gems arc (SPT0615-JD1), a strongly-lensed galaxy emitting light when the Universe was roughly 460 million years old, looking back across 97% of cosmic time. The Cosmic Gems arc was initially discovered in NASA/ESA Hubble Space Telescope images obtained by the RELICS (Reionization Lensing Cluster Survey) programme of the lensing galaxy cluster SPT-CL J0615−5746.  With Webb, the science team can now see where stars formed and how they are distributed, in a similar way to how the Hubble Space Telescope is used to study local galaxies. Webb’s view provides a unique opportunity to study star formation and the inner workings of infant galaxies at such an unprecedented distance.  [Image description: A field of galaxies on the black background of space. In the middle is a collection of dozens of yellowish galaxies that form a foreground galaxy cluster. Among them are distorted linear features, which mostly appear to follow invisible concentric circles curving around the centre of the image. The linear features are created when the light of a background galaxy is bent and magnified through gravitational lensing. A variety of brightly coloured, red and blue galaxies of various shapes are scattered across the image, making it feel densely populated.]

The international astronomy outlet Universe Today has published a feature on a discovery by SKYCR director Homer Dávila Gutiérrez: a previously uncatalogued gravitational arc candidate, A1, in the massive galaxy cluster MACS J0308.9+2645, identified from publicly available JWST NIRCam data. Found among 1,591 candidates across 54 public fields, A1 is best interpreted as a galaxy at redshift ~1.4, stretched and magnified by the cluster's gravity — a discovery hiding in Webb's public archive, with the definitive lens-model test still in progress.

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