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(Abridged) We combine deep HST grism spectroscopy with a new Bayesian methodto derive maps of gas-phase metallicity, nebular dust extinction, andstar-formation rate for 10 star-forming galaxies at high redshift($1.2<z<2.3$). Exploiting lensing magnification by the foreground clusterMACS1149.6+2223, we reach sub-kpc spatial resolution and push the stellar masslimit associated with such high-z spatially resolved measurements below$10^8M_\odot$ for the first time. Our maps exhibit diverse morphologies,indicative of various effects such as efficient radial mixing from tidaltorques, rapid accretion of low-metallicity gas, etc., which can affect the gasand metallicity distributions in individual galaxies. Based upon an exhaustivesample of all existing sub-kpc metallicity gradients at high-z, we find thatpredictions given by analytical chemical evolution models assuming a relativelyextended star-formation profile in the early disk formation phase can explainthe majority of observed gradients, without involving galactic feedback orradial outflows. We observe a tentative correlation between stellar mass andmetallicity gradient, consistent with the downsizing galaxy formation picturethat 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 showshallower metallicity gradients. In addition, we compile a sample ofhomogeneously cross-calibrated integrated metallicity measurements spanningthree orders of magnitude in stellar mass at $z\sim1.8$. We use this sample tostudy the mass-metallicity relation (MZR) and test the fundamental metallicityrelation (FMR). The slope of the observed MZR can rule out the momentum-drivenwind model at 3-$\sigma$ confidence level. We find no significant offset withrespect to the FMR, taking into account the intrinsic scatter and measurementuncertainties.

astrophysical journal/the astrophysical journal

The Grism Lens-Amplified Survey from Space (GLASS) X. Sub-kpc resolution  gas-phase metallicity maps at cosmic noon behind the Hubble Frontier Fields  cluster MACS1149.6+2223