Speaker
Description
Using state-of-the-art analysis methods, we reduce the new NIRISS wide-field grism data and NIRSpec multi-object spectroscopic (MOS) data. The cross calibration of two complementary spectroscopic modes opens up new key window on unbiased investigation of star formation, feedback, and ISM properties in and beyond the cosmic noon epoch. We bring forth the first spatially resolved analysis of high-redshift galaxies with JWST grism instruments and measure the first gas-phase metallicity radial gradient with sub-kpc resolution at z≥3. Using the NIRSpec MOS data in high-resolution gratings, we compile a large sample of galaxies at z~0-7 whose [S ii] λ6732/[S ii]λ6718 and [O ii]λ3726/[O ii]λ3729 line doublets are well resolved to shed light upon their ISM electron density and ionization properties. The exquisite sensitivity and wavelength coverage of the NIRSpec spectroscopy in prism mode gives us an excellent chance to identify unique spectral features in galaxies in the epoch of reionization. We discover the highest redshift galaxy, spectroscopically confirmed at z=8.1623, with PopIII-like stellar populations. This galaxy candidate hosting the first generation stars opens up new key frontiers on galaxy evolution and stellar physics in the early Universe.
