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PHANGS-JWST First Results: The Influence of Stellar Clusters on PAHs in Nearby Galaxies

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arxiv 2212.00130 v1 pith:46RIIQBQ submitted 2022-11-30 astro-ph.GA

PHANGS-JWST First Results: The Influence of Stellar Clusters on PAHs in Nearby Galaxies

Daniel A. Dale , M\'ed\'eric Boquien , Ashley T. Barnes , Francesco Belfiore , F. Bigiel , Yixian Cao , Rupali Chandar , J\'er\'emy Chastenet
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M\'elanie Chevance Sinan Deger Oleg V. Egorov Kathryn Grasha Brent Groves Hamid Hassani Kiana F. Henny Ralf S. Klessen Kathryn Kreckel J.M. Diederik Kruijssen Kirsten L. Larson Janice C. Lee Adam K. Leroy Daizhong Liu Eric J. Murphy Erik Rosolowsky Karin Sandstrom Eva Schinnerer Jessica Sutter David A. Thilker Elizabeth J. Watkins Bradley C. Whitmore Thomas G. Williams
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keywords stellarclustersgalaxiespahsassociationsdustjwstnearby
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We present a comparison of theoretical predictions of dust continuum and polycyclic aromatic hydrocarbon (PAH) emission with new JWST observations in three nearby galaxies: NGC 628, NGC 1365, and NGC 7496. Our analysis focuses on a total of 1063 compact stellar clusters and 2654 stellar associations previously characterized by HST in the three galaxies. We find that the distributions and trends in the observed PAH-focused infrared colors generally agree with theoretical expectations, and that the bulk of the observations is more aligned with models of larger, ionized PAHs. These JWST data usher in a new era of probing interstellar dust and studying how the intense radiation fields near stellar clusters and associations play a role in shaping the physical properties of PAHs.

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