Low-J CO Line Ratios from Single-dish CO Mapping Surveys and PHANGS-ALMA

doi:10.3847/1538-4357/ac3490

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/123341

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/123341

题名:	Low-J CO Line Ratios from Single-dish CO Mapping Surveys and PHANGS-ALMA
作者:	Leroy, Adam K.;Rosolowsky, Erik;Usero, Antonio;Sandstrom, Karin;Schinnerer, Eva;Schruba, Andreas;Bolatto, Alberto D.;Sun, Jiayi;Barnes, Ashley. T.;Belfiore, Francesco;Bigiel, Frank;Brok, Jakob S. den;Cao, Yixian;Chiang, I. -Da;Chevance, Mélanie;Dale, Daniel A.;Eibensteiner, Cosima;Faesi, Christopher M.;Glover, Simon C. O.;Hughes, Annie;Donaire, María J. Jiménez;Klessen, Ralf S.;Koch, Eric W.;Kruijssen, J. M. Diederik;Liu, Daizhong;Meidt, Sharon E.;Pan, Hsi-An;Pety, Jérôme;Puschnig, Johannes;Querejeta, Miguel;Saito, Toshiki;Sardone, Amy;Watkins, Elizabeth J.;Weiss, Axel;Williams, and Thomas G.
日期:	2022-03-10
上传时间:	2023-04-28 17:46:18 (UTC+8)
出版者:	Institute of Physics Publishing, Inc.
摘要:	We measure the low-J CO line ratios R21 ≡ CO (2–1)/CO (1–0), R32 ≡ CO (3–2)/CO (2–1), and R31 ≡CO (3–2)/CO (1–0) using whole-disk CO maps of nearby galaxies. We draw CO (2–1) from PHANGS-ALMA, HERACLES, and follow-up IRAM surveys; CO (1–0) from COMING and the Nobeyama CO Atlas of Nearby Spiral Galaxies; and CO (3–2) from the James Clerk Maxwell Telescope Nearby Galaxy Legacy Survey and Atacama Pathfinder Experiment Large APEX Sub-Millimetre Array mapping. All together, this yields 76, 47, and 29 maps of R21, R32, and R31 at 20'' ∼ 1.3 kpc resolution, covering 43, 34, and 20 galaxies. Disk galaxies with high stellar mass, $\mathrm{log}({M}_{\star }/{M}_{\odot })=10.25\mbox{--}11$, and star formation rate (SFR) = 1–5 M⊙ yr−1, dominate the sample. We find galaxy-integrated mean values and a 16%–84% range of R21 = 0.65 (0.50–0.83), R32 = 0.50 (0.23–0.59), and R31 = 0.31 (0.20–0.42). We identify weak trends relating galaxy-integrated line ratios to properties expected to correlate with excitation, including SFR/M⋆ and SFR/LCO. Within galaxies, we measure central enhancements with respect to the galaxy-averaged value of ∼${0.18}_{-0.14}^{+0.09}$ dex for R21, ${0.27}_{-0.15}^{+0.13}$ dex for R31, and ${0.08}_{-0.09}^{+0.11}$ dex for R32. All three line ratios anticorrelate with galactocentric radius and positively correlate with the local SFR surface density and specific SFR, and we provide approximate fits to these relations. The observed ratios can be reasonably reproduced by models with low temperature, moderate opacity, and moderate densities, in good agreement with expectations for the cold interstellar medium. Because the line ratios are expected to anticorrelate with the CO (1–0)-to-H2 conversion factor, ${\alpha }_{\mathrm{CO}}^{1-0}$, these results have general implications for the interpretation of CO emission from galaxies.
關聯:	The Astrophysical Journal 927(2), p.28
DOI:	10.3847/1538-4357/ac3490
显示于类别:	[物理學系暨研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	65	检视/开启

在機構典藏中所有的数据项都受到原著作权保护.

TAIR相关文章

数据加载中.....