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¹³CO/C¹⁸O Gradients across the Disks of Nearby Spiral Galaxies

Jimenez-Donaire, Maria J.; Cormier, Diane; Bigiel, Frank; Leroy, Adam K; Gallagher, Molly; Krumholz, Mark; Usero, Antonio; Hughes, Annie; Kramer, Carsten; Meier, David; Murphy, Eric; Pety, Jerome; Schinnerer, Eva; Schruba, Andreas; Schuster, Karl; Sliwa, Kazimierz; Tomicic, Neven


We use the IRAM Large Program EMPIRE and new high-resolution ALMA data to measure 13CO(1-0)/C18O(1-0) intensity ratios across nine nearby spiral galaxies. These isotopologues of 12CO are typically optically thin across most of the area in galaxy disks, and this ratio allows us to gauge their relative abundance due to chemistry or stellar nucleosynthesis effects. Resolved 13CO/C18O gradients across normal galaxies have been rare due to the faintness of these lines. We find a mean 13CO/C18O...[Show more]

CollectionsANU Research Publications
Date published: 2017
Type: Journal article
Source: Astrophysical Journal Letters
DOI: 10.3847/2041-8213/836/2/L29
Access Rights: Open Access


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