James Webb Space Telescope Feed Post
Harvard ADS: JWST NIRSpec Spectroscopy of the Triply Lensed z = 10.17 Galaxy MACS0647–JD
Paper abstract: We present JWST/NIRSpec prism spectroscopy of MACS0647-JD, a triply lensed z ~ 11 candidate discovered in Hubble Space Telescope imaging and spatially resolved by JWST imaging into two components, A and B. Spectroscopy of component A yields a spectroscopic redshift z = 10.17 based on seven detected emission lines: C III] ? ?1907, 1909, [O II] ?3727, [Ne III] ?3869, [Ne III] ?3968, Hd ?4101, H? ?4340, and [O III] ?4363. These are the second-most distant detections of these emission lines to date, in a galaxy observed just 460 million years after the Big Bang. Based on observed and extrapolated line flux ratios we derive a gas-phase metallicity 12 + log(O/H) ~ 7.5–8.0, or Z ~ (0.06–0.2) Z ?, ionization parameter
