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PAH Marks the Spot: Digging for Buried Clusters in Nearby Star-forming Galaxies

  • Authors: Gabrielle B. Graham, Daniel A. Dale, Chase L. Smith, Elisabeth Brann, Kaycee D. Conder, Samuel Crowe, Sumitra Dhileepkumar, Nicole A. Imming, Emilio Mendez, Zachary Pleska, Kelsey Sako, Amirnezam Amiri, Ashley T. Barnes, Médéric Boquien, Rupali Chandar, Ryan Chown, Oleg Y. Gnedin, Kathryn Grasha, Stephen Hannon, Hamid Hassani, Rémy Indebetouw, Hwihyun Kim, Jaeyeon Kim, Hannah Koziol, Kirsten L. Larson, Janice C. Lee, Adam K. Leroy, Elias K. Oakes, M. Jimena Rodríguez, Erik Rosolowsky, Karin Sandstrom, Eva Schinnerer, Jessica Sutter, David A. Thilker, Leonardo Ubeda, Bradley C. Whitmore, Tony D. Weinbeck, Thomas G. Williams, Aida Wofford, J. Eduardo Méndez-Delgado, Qiushi Chris Tian

Gabrielle B. Graham et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

Caption: Figure 12.

3.3 μm/3.0 μm flux ratio vs. stellar population age for our embedded cluster candidate sample (cyan circles) and the HST Class 1+2 optical clusters from D. Maschmann et al. (2024) for five galaxies in our sample (orange diamonds). The vertical orange lines denote the 10th to 90th percentile range for each age bin, and the diamond marks the 50th percentile for the Class 1+2 clusters. Optical cluster ages are from D. Thilker et al. (2024), and embedded cluster candidate ages are from Section 5.2.1 of this work. We compare these values to the empirical template from B. C. Whitmore et al. (2025), reddened for an AV = 6 (black track).

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