2021ApJ...908..165P -
Astrophys. J., 908, 165-165 (2021/February-3)
SDSS-IV/MaNGA: can impulsive gaseous inflows explain steep oxygen abundance profiles and anomalously low-metallicity regions?
PACE Z.J., TREMONTI C., SCHAEFER A.L., STARK D.V., WITHERSPOON C.A., MASTERS K.L., DRORY N. and ZHANG K.
Abstract (from CDS):
Gaseous inflows are necessary suppliers of galaxies' star-forming fuel, but are difficult to characterize at the survey scale. We use integral-field spectroscopic measurements of gas-phase metallicity and single-dish radio measurements of total atomic gas mass to estimate the magnitude and frequency of gaseous inflows incident on star-forming galaxies. We reveal a mutual correlation between steep oxygen abundance profiles between 0.25 and 1.5 Re, increased variability of metallicity between 1.25 and 1.75 Re, and elevated H I content at fixed total galaxy stellar mass. Employing a simple but intuitive inflow model, we find that galaxies with total stellar mass less than 1010.1 M☉ have local oxygen abundance profiles consistent with reinvigoration by inflows. Approximately 10%-25% of low-mass galaxies possess signatures of recent accretion, with estimated typical enhancements of approximately 10%-90% in local gas mass surface density. Higher-mass galaxies have limited evidence for such inflows. The large diversity of H I mass implies that inflow-associated gas ought to reside far from the star-forming disk. We therefore propose that a combination of high H I mass, steep metallicity profile between 0.25 and 1.5 Re, and wide metallicity distribution function between 1.25 and 1.75 Re be employed to target possible hosts of inflowing gas for high-resolution radio follow-up.
Abstract Copyright:
© 2021. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Disk galaxies - Galaxies - Galactic and extragalactic astronomy - Galaxy chemical evolution - Galaxy evolution - Chemical enrichment - Neutral hydrogen clouds
Status at CDS
:
Large table(s) of objects being ingested in VizieR.
Simbad objects:
631
Full paper
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