Wang, XinXinWangJones, Tucker A.Tucker A.JonesTreu, TommasoTommasoTreuMorishita, TakahiroTakahiroMorishitaAbramson, Louis E.Louis E.AbramsonBrammer, Gabriel B.Gabriel B.BrammerHuang, Kuang-HanKuang-HanHuangMalkan, Matthew A.Matthew A.MalkanSchmidt, Kasper B.Kasper B.SchmidtFONTANA, AdrianoAdrianoFONTANAGRILLO, CLAUDIOCLAUDIOGRILLOHenry, Alaina L.Alaina L.HenryKarman, WouterWouterKarmanKelly, Patrick L.Patrick L.KellyMason, Charlotte A.Charlotte A.MasonMERCURIO, AMATAAMATAMERCURIORosati, PieroPieroRosatiSharon, KerenKerenSharonTrenti, MicheleMicheleTrentiVulcani, BenedettaBenedettaVulcani2021-01-112021-01-1120170004-637Xhttp://hdl.handle.net/20.500.12386/29673We combine deep Hubble Space Telescope grism spectroscopy with a new Bayesian method to derive maps of gas-phase metallicity for 10 star-forming galaxies at high redshift (1.2≲ z≲ 2.3). Exploiting lensing magnification by the foreground cluster MACS1149.6+2223, we reach sub-kiloparsec spatial resolution and push the limit of stellar mass associated with such high-z spatially resolved measurements below {10}<SUP>8</SUP> {M}<SUB>☉ </SUB> for the first time. Our maps exhibit diverse morphologies, indicative of various effects such as efficient radial mixing from tidal torques, rapid accretion of low-metallicity gas, and other physical processes that can affect the gas and metallicity distributions in individual galaxies. Based upon an exhaustive sample of all existing sub-kiloparesec resolution metallicity gradient measurements at high z, we find that predictions given by analytical chemical evolution models assuming a relatively extended star-formation profile in the early disk-formation phase can explain the majority of observed metallicity gradients, without involving galactic feedback or radial outflows. We observe a tentative correlation between stellar mass and metallicity gradients, consistent with the “downsizing” galaxy formation picture that more massive galaxies are more evolved into a later phase of disk growth, where they experience more coherent mass assembly at all radii and thus show shallower metallicity gradients. In addition to the spatially resolved analysis, we compile a sample of homogeneously cross-calibrated integrated metallicity measurements spanning three orders of magnitude in stellar mass at z ∼ 1.8. We use this sample to study the mass-metallicity relation (MZR) and find that the slope of the observed MZR can rule out the momentum-driven wind model at a 3σ confidence level.STAMPAenArticle10.3847/1538-4357/aa603c2-s2.0-85015197667000401171200006https://iopscience.iop.org/article/10.3847/1538-4357/aa603c2017ApJ...837...89WFIS/05 - ASTRONOMIA E ASTROFISICA