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VENUS: A Strongly Lensed Clumpy Galaxy at z ∼ 11–12 Behind the Galaxy Cluster MACS J0257.1-2325
Minami Nakane (The University of Tokyo), Vasily Kokorev (The University of Texas at Austin), Seiji Fujimoto (University of Toronto), Masami Ouchi (The Graduate University for Advanced Studies, SOKENDAI, National Astronomical Observatory of Japan), Derek J. McLeod (University of Edinburgh), Miriam Golubchik (Ben-Gurion University of the Negev), Masamune Oguri (Chiba University), Adi Zitrin (Ben-Gurion University of the Negev), C Bondestam (University of Edinburgh), Callum T. Donnan (NSF NOIRLab), Gabriel Brammer (University of Copenhagen), Steven L. Finkelstein (The University of Texas at Austin), Chris J. Willott (Herzberg Institute of Astrophysics, National Research Council Canada), Gregor Rihtaršič (University of Ljubljana), G. Desprez (University of Groningen), Angela Adamo (Stockholm University), E. Vanzella (Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics), Maruša Bradač (University of Ljubljana, University of California, Davis), Matteo Messa (Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics), Hiroto Yanagisawa (The University of Tokyo), Fengwu Sun (Center for Astrophysics Harvard & Smithsonian), Henry C. Ferguson (Space Telescope Science Institute), Ray A. Lucas (Space Telescope Science Institute), Dan Coe (Space Telescope Science Institute, Association of Universities for Research in Astronomy), Johan Richard (Université de Lyon), Abdurrouf (Indiana University), Hollis B. Akins (The University of Texas at Austin), Joseph F. V. Allingham (Ben-Gurion University of the Negev), R. Amorín (Consejo Superior de Investigaciones Científicas, Instituto de Astrofísica de Andalucía), Yoshihisa Asada, Hakim Atek (Sorbonne Université), F. E. Bauer (University of Tarapacá), Rachel Bezanson (University of Pittsburgh), Larry Bradley (Space Telescope Science Institute), John Chisholm (The University of Texas at Austin), Christopher J. Conselice (University of Manchester), Pratika Dayal (University of Toronto), Miroslava Dessauges-Zavadsky (University of Geneva), Jose Maria Diego (Consejo Superior de Investigaciones Científicas, Instituto de Física de Cantabria), Andreas L. Faisst (California Institute of Technology), Gavin Farley (University of Toronto), Qinyue Fei (University of Toronto), Brenda Frye (University of Arizona), Yoshinobu Fudamoto (Chiba University), Lukas J. Furtak (The University of Texas at Austin), Yuichi Harikane (The University of Tokyo), Tiger Yu-Yang Hsiao (The University of Texas at Austin), Yolanda Jiménez-Teja (Consejo Superior de Investigaciones Científicas, National Observatory), Jeyhan S. Kartaltepe (Rochester Institute of Technology), T. Kiyota (The Graduate University for Advanced Studies, SOKENDAI, National Astronomical Observatory of Japan), Anton M. Koekemoer (Space Telescope Science Institute), Claudia del P. Lagos (The University of Western Australia, ASTRO-3D), G. Magdis (Technical University of Denmark), Ashish Kumar Meena (Indian Institute of Science Bangalore), Lamiya Mowla, Gaël Noirot (Space Telescope Science Institute), Pascal A. Oesch (University of Geneva), Yoshiaki Ono (The University of Tokyo), Rafael Ortiz (Arizona State University), Richard Pan (Tufts University), Casey Papovich (Texas A&M University), Justin D. R. Pierel (Space Telescope Science Institute), Massimo Ricotti (University of Maryland, College Park), Lucy Robbins (Tufts University), D. Schaerer (University of Geneva, Centre National de la Recherche Scientifique), Raffaella Schneider (Sapienza University of Rome), Tommaso Treu (University of California System), Francesco M. Valentino (Technical University of Denmark), Rogier A. Windhorst (Arizona State University), Volker Bromm (The University of Texas at Austin), Eiichi Egami (University of Arizona), Mauro González-Otero (Consejo Superior de Investigaciones Científicas, Instituto de Astrofísica de Andalucía), Kotaro Kohno (The University of Tokyo), Ivo Labbé (Swinburne University of Technology), Jorryt Matthee (Institute of Science and Technology Austria), Marcie Mun (Sorbonne Université), Rohan P. Naidu (Massachusetts Institute of Technology), Roberta Tripodi (University of Ljubljana, Astronomical Observatory of Rome)
Résumé : Abstract We present the discovery of a strongly lensed galaxy at z ∼ 11–12, dubbed the “Misty Moons,” identified in the JWST Treasury Survey, Vast Exploration for Nascent, Unexplored Sources. The Misty Moons is gravitationally lensed by the galaxy cluster MACS J0257.1-2325 at z = 0.505, and has five multiple images suggested by two independent lens models. Two of the five images, ID1 and ID2 ( μ ∼ 20–30), are very bright (F200W∼26 AB mag) and exhibit blue SEDs with prominent Ly α breaks. In the source plane, the Misty Moons is a sub- L * galaxy ( M UV ∼ −18.0 mag) resolved into multiple stellar clumps, each of which has an effective radius of r eff ∼ 10–70 pc and a stellar mass of ∼10 7 M ⊙ . These clumps dominate the stellar mass budget of the Misty Moons (≳80%), similar to other high- z clumps, which suggests a highly clustered mode of star formation in the early Universe, unlike seen in local dwarf galaxies. We convolve the source-plane image with the JWST/NIRCam point-spread function to produce a mock NIRCam image of the Misty Moons without lensing magnification and find that the intrinsic galaxy has a radial surface-brightness profile comparable to those of z ≳ 10 faint galaxies, such as JADES-GS-z13-0 and JADES-GS-z14-1, indicating that the Misty Moons represents a typical z ≳ 10 faint galaxy. The Misty Moons, a lensed galaxy with resolved internal structures, provides an ideal laboratory for exploring the early stages of galaxy formation at z ≳ 10.