NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T21:23:36 PDT
Help | Comment | NED Home

For refcode 2017ApJ...836L..29J:
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2017ApJ...836L..29J ^13^CO/C^18^O Gradients across the Disks of Nearby Spiral Galaxies Jimenez-Donaire, Maria J.; Cormier, Diane; Bigiel, Frank; Leroy, Adam K.; Gallagher, Molly; Krumholz, Mark R.; Usero, Antonio; Hughes, Annie; Kramer, Carsten; Meier, David; Murphy, Eric; Pety, Jerome; Schinnerer, Eva; Schruba, Andreas; Schuster, Karl; Sliwa, Kazimierz; Tomicic, Neven Abstract. We use the IRAM Large Program EMPIRE and new high-resolution ALMA data to measure ^13^CO(1-0)/C^18^O(1-0) intensity ratios across nine nearby spiral galaxies. These isotopologues of ^12^CO 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 ^13^CO/C^18^O gradients across normal galaxies have been rare due to the faintness of these lines. We find a mean ^13^CO/C^18^O ratio of 6.0 +/- 0.9 for the central regions of our galaxies. This agrees well with results in the Milky Way, but differs from results for starburst galaxies (3.4 +/- 0.9) and ultraluminous infrared galaxies (1.1 +/- 0.4). In our sample, the ^13^CO/C^18^O ratio consistently increases with increasing galactocentric radius and decreases with increasing star formation rate surface density. These trends could be explained if the isotopic abundances are altered by fractionation; the sense of the trends also agrees with those expected for carbon and oxygen isotopic abundance variations due to selective enrichment by massive stars. Key words: galaxies: ISM, ISM: molecules, radio lines: galaxies
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home