Surveying the Whirlpool at Arcseconds with NOEMA (SWAN): III. 13CO/C18O ratio variations across the M51 galaxy
學年 114
學期 1
出版（發表）日期 2025-10-24
作品名稱 Surveying the Whirlpool at Arcseconds with NOEMA (SWAN): III. 13CO/C18O ratio variations across the M51 galaxy
作品名稱（其他語言）
著者 I. Galić; Mallory Thorp; Frank Bigiel; Eva Schinnerer; Jakob den Brok; Hao He; María J. Jiménez-Donaire; Lukas Neumann; Jerome Pety; Sophia K. Stuber; Antonio Usero; Ashley T. Barnes; Dario Colombo; Daniel A. Dale; Timothy A. Davis; J. E. Méndez-Delgado; Hsi-An Pan; Miguel Querejeta; Thomas G. Williams
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出版者
著錄名稱、卷期、頁數 Astronomy & Astrophysics 702, p. A250
摘要 Context. CO isotopologues are common tracers of the bulk molecular gas in extragalactic studies, providing insights into the physical and chemical conditions of the cold molecular gas, a reservoir for star formation. Aims. Since star formation occurs within molecular clouds, mapping CO isotopologues on the scale of clouds is important to understanding the processes driving star formation. However, achieving this mapping at such scales is challenging and time-intensive. The Surveying the Whirlpool Galaxy at Arcseconds with NOEMA (SWAN) survey addresses this by using the Institut de radioastronomie millimétrique (IRAM) NOrthern Extended Millimeter Array (NOEMA) to map the 13CO(1−0) and C18O(1−0) isotopologues, alongside several dense gas tracers, in the nearby star-forming galaxy M51 at high sensitivity and spatial resolution (≈125 pc). Methods. We examine the 13CO(1−0) to C18O(1−0) line emission ratio as a function of galactocentric radius and star formation rate surface density to infer how different chemical and physical processes affect this ratio at cloud scales across different galactic environments: nuclear bar, molecular ring, and northern and southern spiral arms. Results. In line with previous studies conducted at kiloparsec scales for nearby star-forming galaxies, we find a moderate positive correlation with galactocentric radius and a moderate negative correlation with star formation rate surface density across the field of view (FoV), with slight variations depending on the galactic environment. Conclusions. We propose that selective nucleosynthesis and changes in the opacity of the gas are the primary drivers of the observed variations in the ratio.
關鍵字 ISM: abundances; ISM: molecules; galaxies: ISM; galaxies: individual: M51
語言 en
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期刊性質 國外
收錄於 SCI
產學合作
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審稿制度 是
國別 DEU
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出版型式 ,電子版
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