In:
The Astrophysical Journal Supplement Series, American Astronomical Society, Vol. 268, No. 1 ( 2023-09-01), p. 3-
Abstract:
We present 13 CO( J = 1 → 0) observations for the EDGE-CALIFA survey, which is a mapping survey of 126 nearby galaxies at a typical spatial resolution of 1.5 kpc. Using detected 12 CO emission as a prior, we detect 13 CO in 41 galaxies via integrated line flux over the entire galaxy and in 30 galaxies via integrated line intensity in resolved synthesized beams. Incorporating our CO observations and optical IFU spectroscopy, we perform a systematic comparison between the line ratio 12 / 13 ≡ I [ 12 CO ( J = 1 → 0 ) ] / I [ 13 CO ( J = 1 → 0 ) ] and the properties of the stars and ionized gas. Higher 12 / 13 values are found in interacting galaxies compared to those in noninteracting galaxies. The global 12 / 13 slightly increases with infrared color F 60 / F 100 but appears insensitive to other host-galaxy properties such as morphology, stellar mass, or galaxy size. We also present azimuthally averaged 12 / 13 profiles for our sample up to a galactocentric radius of 0.4 r 25 (∼6 kpc), taking into account the 13 CO nondetections by spectral stacking. The radial profiles of 12 / 13 are quite flat across our sample. Within galactocentric distances of 0.2 r 25 , the azimuthally averaged 12 / 13 increases with the star formation rate. However, Spearman rank correlation tests show the azimuthally averaged 12 / 13 does not strongly correlate with any other gas or stellar properties in general, especially beyond 0.2 r 25 from the galaxy centers. Our findings suggest that in the complex environments in galaxy disks, 12 / 13 is not a sensitive tracer for ISM properties. Dynamical disturbances, like galaxy interactions or the presence of a bar, also have an overall impact on 12 / 13 , which further complicates the interpretations of 12 / 13 variations.
Type of Medium:
Online Resource
ISSN:
0067-0049
,
1538-4365
DOI:
10.3847/1538-4365/acd840
Language:
Unknown
Publisher:
American Astronomical Society
Publication Date:
2023
detail.hit.zdb_id:
2006860-8
detail.hit.zdb_id:
2207650-5
SSG:
16,12
Permalink