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-猫眼课题宝

DOI：

10.3847/2041-8213/acab01

发表时间：

2022-12

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

A. Leroy;A. Bolatto;K. Sandstrom;E. Rosolowsky;A. Barnes;F. Bigiel;M. Boquien;J. D. den Brok;Yixian Cao;J. Chastenet;M. Chevance;I. Chiang 江;R. Chown;D. Colombo;S. Ellison;E. Emsellem;K. Grasha;J. Henshaw;A. Hughes;R. Klessen;E. Koch;Jaeyeon Kim;K. Kreckel;J. Kruijssen;K. Larson;Janice C. Lee;R. C. Levy;Lihwai Lin;Daizhong Liu;S. Meidt;J. Pety;M. Querejeta;M. Rubio;T. Saito;S. Salim;E. Schinnerer;M. Sormani;Jiayi Sun;D. Thilker;A. Usero;S. Vogel;E. Watkins;Cory M. Whitcomb;T. Williams;C. Wilson

我们探讨了大质量恒星形成星系的中红外（中红外）和CO旋转线发射之间的关系，这是局域宇宙中最紧密的标度之一。我们收集了大量的未分辨和中等空间分辨的CO（1-0）和CO（2-1）强度（I CO）和中红外强度（I MIR）的测量结果，在8，12，22和24 μm处。I CO与I MIR的关系可以用幂律来描述，斜率为0.7-1.2，归一化I CO为1 K km s−1，I MIR为1 MJy sr−1。斜率和截距都随着线和带的选择而系统地变化。比较CO（1-0）和CO（2-1）测量的关系，我们可以推断R21 = IMIR 0.2，与其他工作一致。8 μm和12 μm波段具有较强的多环芳烃（PAH）特征，与22和24 μm相比，CO与中红外的斜率更陡，这与PAH发射不仅来自CO亮气体，而且来自原子或CO暗气体一致。CO与中红外的比值与全球星系恒星质量（M ˇ）有关，而M ˇ与星星形成率/M ˇ有关。在1001 kpc分辨率下，前四个PHANGS-JWST目标显示出与我们更大的文献样本定量相似的CO-中红外关系，包括显示JWST PAH示踪带的陡峭CO-中红外斜率，尽管我们注意到这些初始数据的样本量较小，并且强度范围有限。

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 R21∝IMIR0.2 , 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.

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

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