20.500.12556/RUL-162192 JWST NIRSpec spectroscopy of the triply lensed z = 10.17 galaxy MACS0647–JD 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] λλ1907, 1909, [O II] λ3727, [Ne III] λ3869, [Ne III] λ3968, Hδ λ4101, Hγ λ4340, and [O III] λ4363. 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) Ze, ionization parameter log(U) = −1.9 ± 0.2, and an ionizing photon production efficiency log 25.2 ± 0.2 erg-1 Hz. The spectrum has a softened Lyα break, evidence for a strong Lyα damping wing. The Lyα damping wing also suppresses the F150W photometry, explaining the slightly overestimated photometric redshift z = 10.6 ± 0.3. MACS0647−JD has a stellar mass log(M/Me) = 8.1 ± 0.3, including ∼6 × 10 7 Me in component A, most of which formed recently (within ∼20 Myr) with a star formation rate ∼ 2 ± 1 Me yr−1 , all within an effective radius 70 ± 24 pc. Spectroscopy of a fainter companion galaxy C separated by a distance of ∼ 3 kpc reveals a Lyman break consistent with z ∼ 10.17. MACS0647−JD is likely the most distant galaxy merger known. galaxies high-redshift galaxies early universe strong gravitational lensing galaxy spectroscopy reionization true false true Angleški jezik Ni določen Članek v reviji 2024-09-19 13:58:11 2024-09-19 13:58:11 2024-09-23 03:36:25 0000-00-00 00:00:00 2024 0 0 16 str. art. A8 Vol. 973 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 524.8 1538-4357 10.3847/1538-4357/ad5da8 208089091 Hsiao_2024_ApJ_973_8.pdf Hsiao_2024_ApJ_973_8.pdf 1 559646DF2BBE9ACAEE70DAC90F914C93 5a768dac09b63151562803317beacb3b29fe211078657747f6159f70dfa685c2 f9e45c67-7681-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=191377 https://iopscience.iop.org/article/10.3847/1538-4357/ad35bc/pdf 1 57861f44-767e-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=191370 Fakulteta za matematiko in fiziko 0 0 0