Leroy, AK, Bolatto, AD, Sandstrom, K, Rosolowsky, E, Barnes, AT, Bigiel, F, Boquien, M, den Brok, JS, Cao, Y, Chastenet, J, Chevance, M, Chiang, ID, Chown, R, Colombo, D, Ellison, SL, Emsellem, E, Grasha, K, Henshaw, JD ORCID: 0000-0001-9656-7682, Hughes, A, Klessen, RS et al
(2023)
PHANGS-JWST First Results: A Global and Moderately Resolved View of Mid-infrared and CO Line Emission from Galaxies at the Start of the JWST Era.
Astrophysical Journal Letters, 944 (2).
ISSN 2041-8205
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PHANGS-JWST First Results A Global and Moderately Resolved View of Mid-infrared and CO Line Emission from Galaxies at the Start of the JWST Era.pdf - Published Version Available under License Creative Commons Attribution. Download (4MB) | Preview |
Abstract
We explore the relationship between mid-infrared (mid-IR) and CO rotational line emission from massive star-forming galaxies, which is one of the tightest scalings in the local universe. We assemble a large set of unresolved and moderately (∼1 kpc) spatially resolved measurements of CO (1-0) and CO (2-1) intensity, I CO, and mid-IR intensity, I MIR, at 8, 12, 22, and 24 μm. The I CO versus I MIR relationship is reasonably described by a power law with slopes 0.7-1.2 and normalization I CO ∼ 1 K km s−1 at I MIR ∼ 1 MJy sr−1. Both the slopes and intercepts vary systematically with choice of line and band. The comparison between the relations measured for CO (1-0) and CO (2-1) allow us to infer that R 21 ∝ I MIR 0.2 , in good agreement with other work. The 8 μm and 12 μm bands, with strong polycyclic aromatic hydrocarbon (PAH) features, show steeper CO versus mid-IR slopes than the 22 and 24 μm, consistent with PAH emission arising not just from CO-bright gas but also from atomic or CO-dark gas. The CO-to-mid-IR ratio correlates with global galaxy stellar mass (M ⋆) and anticorrelates with star formation rate/M ⋆. At ∼1 kpc resolution, the first four PHANGS-JWST targets show CO-to-mid-IR relationships that are quantitatively similar to our larger literature sample, including showing the steep CO-to-mid-IR slopes for the JWST PAH-tracing bands, although we caution that these initial data have a small sample size and span a limited range of intensities.
Item Type: | Article |
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Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
Divisions: | Astrophysics Research Institute |
Publisher: | American Astronomical Society |
Date of acceptance: | 12 December 2022 |
Date of first compliant Open Access: | 25 September 2024 |
Date Deposited: | 25 Sep 2024 16:07 |
Last Modified: | 04 Jul 2025 08:30 |
DOI or ID number: | 10.3847/2041-8213/acab01 |
URI: | https://researchonline.ljmu.ac.uk/id/eprint/24277 |
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