The CO-to-H2 Conversion Factor in the Barred Spiral Galaxy M83
Abstract
We analyze the CO-to-H2 conversion factor (α CO) in the nearby barred spiral galaxy M83. We present new H I observations from the VLA and single-dish GBT in the disk of the galaxy, and combine them with maps of CO(1-0) integrated intensity and dust surface density from the literature. α CO and the gas-to-dust ratio (δ GDR) are simultaneously derived in annuli of 2 kpc width from R = 1–7 kpc. We find that α CO and δ GDR both increase radially, by a factor of ∼2–3 from the center to the outskirts of the disk. The luminosity-weighted averages over the disk are α CO = 3.14 (2.06, 4.96)
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2024
- DOI:
- 10.3847/1538-4357/ad40a0
- arXiv:
- arXiv:2404.14503
- Bibcode:
- 2024ApJ...968...97L
- Keywords:
-
- Interstellar medium;
- Gas-to-dust ratio;
- Galactic and extragalactic astronomy;
- Molecular gas;
- Interstellar dust;
- CO line emission;
- 847;
- 638;
- 563;
- 1073;
- 836;
- 262;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication in ApJ