The broad spectral coverage and high angular resolution of GLASS are idealÂ for detailed studies of galaxies at intermediate redshifts. In Jones et al. 2015Â our teamÂ analyzed the spatially resolved stellar mass and gas-phase metallicity inÂ a system of three strongly lensed galaxies at redshift z=1.855, drawn fromÂ the first complete GLASS data set (MACS0717).
These initial GLASS data reveal strong, spatially extended emission linesÂ in all three galaxies. We find no significant radial variation inÂ metallicity, possibly as a result of gravitational interaction among the galaxies.
These results represent the first constraint of metallicity gradientÂ evolution using HST. Our analysis also extends previous studies of theÂ mass-metallicity relation to an order of magnitude lower stellar mass,Â confirming that GLASS is able to characterize dwarf galaxies atÂ intermediate redshift. The mass-metallicity relation and metallicityÂ gradient evolution are both valuable diagnostics of how gas cycles in andÂ out of galaxies over cosmic time.
For more details go toÂ http://adsabs.harvard.edu/abs/2014arXiv1410.0967J