Polycyclic Aromatic Hydrocarbon (PAH) Luminous Galaxies In JWST CEERS Data

By Keith Cowing
Status Report
January 3, 2024
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Polycyclic Aromatic Hydrocarbon (PAH) Luminous Galaxies In JWST CEERS Data
The AGN-Composite-SFG colour selection on 𝑆18/𝑆10-𝑆15/𝑆7.7. The inner circle is the AGN criteria, and the outer circle is the SFG criteria from (Kirkpatrick et al. 2017). The region between the two circles is composites. The red points are the PAH luminous galaxies. The black arrow is the extinction 𝐴𝑣 = 10. — astro-ph.GA

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 ΞΌm 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(S15/S10)>0.8. The SED fitting analysis indicates that these galaxies are star-forming galaxies with total IR luminosities of 1010 ∼ 1011.5 LβŠ™ at z ∼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∼1.

Our result demonstrates that JWST can detect PAH emissions from normal star-forming galaxies at z∼1, in addition to ultra-luminous infrared galaxies (ULIRGs) or luminous infrared galaxies (LIRGs).

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

Comments: 12 pages, 20 figures, 4 tables. Accepted by MNRAS. A summary video is at this https URL
Subjects: Astrophysics of Galaxies (astro-ph.GA); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:2401.01043 [astro-ph.GA] (or arXiv:2401.01043v1 [astro-ph.GA] for this version)
Submission history
From: Yu-Wei Lin
[v1] Tue, 2 Jan 2024 05:35:14 UTC (1,342 KB)
Astrobiology, Astrochemistry,

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) πŸ––πŸ»