Subgalactic Scaling Relations with T e-based Metallicities of Low-metallicity Regions in Galaxies: Metal-poor Gas Inflow May Have Important Effects?
Abstract
The scaling relationship is a fundamental probe of the evolution of galaxies. Using the integral field spectroscopic data from the Mapping Nearby Galaxies at Apache Point Observatory survey, we select 1698 spaxels with a significant detection of the auroral emission line [O III]λ4363 from 52 galaxies to investigate the scaling relationships at the low-metallicity end. We find that our sample's star formation rate is higher and its metallicity is lower in the scaling relationship than the star-forming sequence after removing the contribution of the Fundamental Metallicity Relation. We also find that the stellar ages of our sample are younger (<1 Gyr) and the stellar metallicities are also lower. Morphological parameters from the Deep Learning catalog indicate that our galaxies are more likely to be mergers. These results suggest that their low-metallicity regions may be related to interaction; the inflow of metal-poor gas may dilute the interstellar medium and form new metal-poor stars in these galaxies during interactions.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 2022
- DOI:
- 10.3847/1538-4357/ac3b55
- arXiv:
- arXiv:2111.10748
- Bibcode:
- 2022ApJ...926...57Y
- Keywords:
-
- 2031;
- 1031;
- 1565;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 12 pages, 10 figures, accepted in ApJ