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arXiv · 2401.01043

Polycyclic aromatic hydrocarbon (PAH) luminous galaxies in JWST CEERS data

Yu-Wei Lin·Cossas K. -W. Wu·Chih-Teng Ling·Tomotsugu Goto·Seong Jin Kim·Ece Kilerci·Tetsuya Hashimoto·Po-Ya Wang·Simon C. -C. Ho·Tiger Yu-Yang Hsiao·Bjorn Jasper R. Raquel·Yuri Uno
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Abstract

It has been an unanswered question how many dusty galaxies have been undetected from the state-of-the-art observational surveys. JWST enables us to detect faint IR galaxies that have prominent polycyclic aromatic hydrocarbon (PAH) features in the mid-IR wavelengths. PAH is a valuable tracer of star formation and dust properties in the mid-infrared wavelength. The JWST Cosmic Evolution Early Release Science (CEERS) fields provide us with wavelength coverage from 7.7 to 21 $\mu$m using six photometric bands of the mid-infrared instrument (MIRI). We have identified galaxies dominated by mid-IR emission from PAHs, termed PAH galaxies. From our multi-band photometry catalogue, we selected ten PAH galaxies displaying high flux ratios of $\log(S_{15}/S_{10}) > 0.8$. The SED fitting analysis indicates that these galaxies are star-forming galaxies with total IR luminosities of $10^{10}$ $\sim$ $10^{11.5}$ $L_{\odot}$ at z $\sim 1$. The morphology of PAH galaxies does not show any clear signatures of major merging or interaction within the MIRI resolution. The majority of them are on the star-formation main sequence at $z \sim 1$. Our result demonstrates that JWST can detect PAH emissions from normal star-forming galaxies at $z \sim 1$, in addition to ultra-luminous infrared galaxies (ULIRGs) or luminous infrared galaxies (LIRGs).

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Yu-Wei Lin, Cossas K. -W. Wu, Chih-Teng Ling, Tomotsugu Goto, Seong Jin Kim, Ece Kilerci, Tetsuya Hashimoto, Po-Ya Wang, Simon C. -C. Ho, Tiger Yu-Yang Hsiao, Bjorn Jasper R. Raquel, Yuri Uno. 2024-01-02. Polycyclic aromatic hydrocarbon (PAH) luminous galaxies in JWST CEERS data. https://arxiv.org/abs/2401.01043

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