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FEAST: JWST Uncovers the Emerging Timescales of Young Star Clusters in M83
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Astronomy. Chalmers University of Technology, Sweden.
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-8192-8091
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0002-8222-8986
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Number of Authors: 262025 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 993, no 1, article id 13Article in journal (Refereed) Published
Abstract [en]

We present JWST NIRCam observations of the emerging young star clusters (eYSCs) detected in the nearby spiral galaxy M83. The NIRcam mosaic encompasses the nuclear starburst, the bar, and the inner spiral arms. The eYSCs, detected in Paα and Brα maps, have been largely missed in previous optical campaigns of young star clusters (YSCs). We distinguish between eYSCI, if they also have compact 3.3 μm polycyclic aromatic hydrocarbon (PAH) emission associated with them, and eYSCII, if they only appear as compact Paα emitters. We find that the variations in the 3.3 μm PAH feature are consistent with an evolutionary sequence where eYSCI evolve into eYSCII and then optical YSCs. This sequence is clear in the F300M​​​​​​−F335M (tracing the excess in the 3.3 μm PAH feature) and the F115W−F187N (tracing the excess in Paα) colors, which become increasingly bluer as clusters emerge. The central starburst stands out as the region where the most massive eYSCs are currently forming in the galaxy. We estimate that only about 20% of eYSCs will remain detectable as compact YSCs. Combining eYSCs and YSCs (≤10 Myr), we recover an average clearing timescale of 6 Myr in which clusters transition from embedded to fully exposed. We see evidence of shorter emergence timescales (∼5 Myr) for more massive (>5 × 103 M) clusters, while star clusters of ∼103 M about 7 Myr. We estimate that eYSCs remain associated with the 3.3 μm PAH emission for 3–4 Myr. Larger samples of eYSC and YSC populations will provide stronger statistics to further test environmental and cluster mass dependencies on the emergence timescale.

Place, publisher, year, edition, pages
2025. Vol. 993, no 1, article id 13
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-249773DOI: 10.3847/1538-4357/ae018cISI: 001599867600001Scopus ID: 2-s2.0-105020268756OAI: oai:DiVA.org:su-249773DiVA, id: diva2:2020272
Available from: 2025-12-10 Created: 2025-12-10 Last updated: 2025-12-10Bibliographically approved

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Knutas, AliceAdamo, AngelaPedrini, AlexBik, ArjanBortolini, GiacomoFaustino Vieira, HelenaÖstlin, Göran

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Knutas, AliceAdamo, AngelaPedrini, AlexBik, ArjanBortolini, GiacomoFaustino Vieira, HelenaÖstlin, Göran
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The Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Astronomy
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