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Spatially Resolved Physical Properties of Young Star Clusters and Star-forming Clumps in the Brightest z > 6 Galaxy, the Strongly Lensed Cosmic Spear at z = 6.2

Authors: Abdurro'uf, Dan Coe, Tom Resseguier, Calla Murphy, Xinfeng Xu, Angela Adamo, Namrata Roy, Alaina Henry, Vasily Kokorev, Gabriel Brammer, Seiji Fujimoto, Henry C. Ferguson, Amanda Pagul, Rogier A. Windhorst, Timothy Heckman, Jose M. Diego, Hollis B. Akins, Joseph F. V. Allingham, Ricardo O. Amorín, Danielle A. Berg, Maruša Bradač, Larry D. Bradley, Wenlei Chen, John Chisholm, Christopher J. Conselice, Pratika Dayal, Miroslava Dessauges-Zavadsky, Andreas L. Faisst, Steven L. Finkelstein, Yoshinobu Fudamoto, Lukas J. Furtak, Yuichi Harikane, Tiger Yu-Yang Hsiao, Yolanda Jimenez-Teja, Anton M. Koekemoer, Rebecca L. Larson, Ray A. Lucas, Matteo Messa, Lamiya Mowla, Minami Nakane, Gaël Noirot, Richard Pan, Massimo Pascale, Johan Richard, Massimo Ricotti, Luke Robbins, Daniel Schaerer, Fengwu Sun, Eros Vanzella, Brian Welch, Chris Willott, Adi Zitrin

Abdurro’uf et al 2026 The Astrophysical Journal 1011 .

Provider: AAS Journals

Caption: Figure 1.

NIRCam color image (red: F277W+F356W, green: F150W+F200W, and blue: F090W+F115W) of the Cosmic Spear, at z = 6.2, in the background of galaxy cluster MACS J0308+2645 at z = 0.356. The strongly lensed galaxy (shown in the two right panels) is resolved into two main components: a pair of large, bright star-forming clumps (1 and 2), and an arc containing three distinct star clusters (3, 4, and 5) which are multiply imaged into seven sources (3a, 3b, 3c, 4a, 4b, 5a, and 5b). The top-left corner inset shows a CI identified from the lens model. It reveals a clumpy morphology, with three distinct substructures (lower limit). The red line represents a lensing critical curve at z = 6.2, while the white lines show contours of constant magnification.

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