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

Media type: E-Article

Title: 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

Contributor: Leroy, Adam K. [Author]; Bolatto, Alberto D. [Author]; Sandstrom, Karin [Author]; Rosolowsky, Erik [Author]; Barnes, Ashley T. [Author]; Bigiel, F. [Author]; Boquien, Médéric [Author]; Brok, Jakob S. den [Author]; Cao, Yixian [Author]; Chastenet, Jérémy [Author]; Chevance, Mélanie [Author]; Chiang, I.-Da [Author]; Chown, Ryan [Author]; Colombo, Dario [Author]; Ellison, Sara L. [Author]; Emsellem, Eric [Author]; Grasha, Kathryn [Author]; Henshaw, Jonathan D. [Author]; Hughes, Annie [Author]; Klessen, Ralf S. [Author]; Koch, Eric W. [Author]; Kim, Jaeyeon [Author]; Kreckel, Kathryn [Author]; Kruijssen, J. M. Diederik [Author]; Larson, Kirsten L. [Author]; Lee, Janice C. [Author]; Levy, Rebecca C. [Author]; Lin, Lihwai [Author]; Liu, Daizhong [Author]; Meidt, Sharon E. [Author]; Pety, Jérôme [Author]; Querejeta, Miguel [Author]; Rubio, Mónica [Author]; Saito, Toshiki [Author]; Salim, Samir [Author]; Schinnerer, Eva [Author]; Sormani, Mattia C. [Author]; Sun, Jiayi [Author]; Thilker, David A. [Author]; Usero, Antonio [Author]; Vogel, Stuart N. [Author]; Watkins, Elizabeth J. [Author]; Whitcomb, Cory M. [Author]; Williams, Thomas G. [Author]; Wilson, Christine D. [Author]

Published: 2023

Language: English

DOI: 10.3847/2041-8213/acab01

Identifier:

Origination:

Footnote: Veröffentlicht: 16. Februar 2023

Description: 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 , 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.

Access State: Open Access

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