JWST Observations of Starbursts: Massive Star Clusters in the Central Starburst of M82

The Astrophysical Journal Letters Pub Date : 2024-09-26 DOI:10.3847/2041-8213/ad7af3

Rebecca C. Levy, Alberto D. Bolatto, Divakara Mayya, Bolivia Cuevas-Otahola, Elizabeth Tarantino, Martha L. Boyer, Leindert A. Boogaard, Torsten Böker, Serena A. Cronin, Daniel A. Dale, Keaton Donaghue, Kimberly L. Emig, Deanne B. Fisher, Simon C. O. Glover, Rodrigo Herrera-Camus, María J. Jiménez-Donaire, Ralf S. Klessen, Laura Lenkić, Adam K. Leroy, Ilse De Looze, David S. Meier, Elisabeth A. C. Mills, Juergen Ott, Mónica Relaño, Sylvain Veilleux, Vicente Villanueva, Fabian Walter and Paul P. van der Werf

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Abstract

We present a near-infrared (NIR) candidate star cluster catalog for the central kiloparsec of M82 based on new JWST NIRCam images. We identify star cluster candidates using the F250M filter, finding 1357 star cluster candidates with stellar masses >104M⊙. Compared to previous optical catalogs, nearly all (87%) of the candidates we identify are new. The star cluster candidates have a median intrinsic cluster radius of ≈1 pc and stellar masses up to 106M⊙. By comparing the color–color diagram to dust-free yggdrasil stellar population models, we estimate that the star cluster candidates have AV ∼ 3−24 mag, corresponding to A2.5μm ∼ 0.3−2.1 mag. There is still appreciable dust extinction toward these clusters into the NIR. We measure the stellar masses of the star cluster candidates, assuming ages of 0 and 8 Myr. The slope of the resulting cluster mass function is β = 1.9 ± 0.2, in excellent agreement with studies of star clusters in other galaxies.

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JWST 星暴观测：M82 中央星爆中的大质量星团

我们根据新的 JWST NIRCam 图像，为 M82 中心千帕秒提供了一份近红外候选星团星表。我们使用F250M滤光片识别候选星团，发现了1357个恒星质量大于104M⊙的候选星团。与以前的光学星表相比，我们发现的几乎所有候选星（87%）都是新的。候选星团的中位本征半径≈1 pc，恒星质量高达106M⊙。通过与无尘 yggdrasil 星群模型的色彩图比较，我们估计候选星团的视角为 AV ∼ 3-24 mag，相当于 A2.5μm ∼ 0.3-2.1 mag。这些星团在近红外仍有明显的尘埃消光。我们测量了候选星团的恒星质量，假设年龄为 0 和 8 Myr。得出的星团质量函数斜率为 β = 1.9 ± 0.2，与其他星系的星团研究结果非常吻合。

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The Astrophysical Journal Letters

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