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While all models for the evolution of galaxies require the accretion of gasto sustain their growth via on-going star formation, it has proven difficult todirectly detect this inflowing material. In this paper we use data of nearbystar-forming galaxies in the SDSS IV Mapping Nearby Galaxies at Apache PointObservatory (MaNGA) survey to search for evidence of accretion imprinted in thechemical composition of the interstellar medium. We measure both the O/H andN/O abundance ratios in regions previously identified as having anomalously lowvalues of O/H. We show that the unusual locations of these regions in the N/Ovs. O/H plane indicate that they have been created through the mixing of diskgas having higher metallicity with accreted gas having lower metallicity. Takentogether with previous analysis on these anomalously low-metallicity regions,these results imply that accretion of metal-poor gas can probably sustain starformation in present-day late-type galaxies.

Evidence for the Accretion of Gas in Star-Forming Galaxies: High N/O Abundances in Regions of Anomalously-Low Metallicity