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We present 13CO(1-0) observations for the EDGE-CALIFA survey, which is amapping survey of 126 nearby galaxies at a typical spatial resolution of 1.5kpc. Using detected 12CO(1-0) emission as a prior, we detect 13CO(1-0) in 41galaxies via integrated line flux over the entire galaxy, and in 30 galaxiesvia integrated line intensity in resolved synthesized beams. Incorporating ourCO observations and optical IFU spectroscopy, we perform a systematiccomparison between the line ratio R12/13 and the properties of the stars andionized gas. Higher R12/13 values are found in interacting galaxies than innon-interacting galaxies. The global R12/13 slightly increases with infraredcolor F60/F100, but appears insensitive to other host galaxy properties such asmorphology, stellar mass, or galaxy size. We also present annulus-averagedR12/13 profiles for our sample up to a galactocentric radius of 0.4r25 (~6kpc), taking into account the 13CO(1-0) non-detections by spectral stacking.The radial profiles of R12/13 are quite flat across our sample. Withingalactocentric distances of 0.2r25, azimuthally-averaged R12/13 increases withstar formation rate. However, the Spearman rank correlation tests show theazimuthally-averaged R12/13 does not strongly correlate with any other gas orstellar properties in general, especially beyond 0.2r25 from the galaxycenters. Our findings suggest that in the complex environments in galaxy disks,R12/13 is not a sensitive tracer for ISM properties. Dynamical disturbances,like galaxy interactions or the presence of a bar, also have an overall impacton R12/13, which further complicate the interpretations of R12/13 variations.

The EDGE-CALIFA Survey: Spatially Resolved 13CO(1-0) Observations and Variations in 12CO(1-0)/13CO(1-0) in Nearby Galaxies on kpc Scales