Yu-Yang Tiger Hsiao (Author), Abdurro'uf (Author), Dan Coe (Author), Rebecca L. Larson (Author), Intae Jung (Author), Maruša Bradač (Author)

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] 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.

Keywords

high-redshift galaxies;strong gravitational lensing;early universe;reionization;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FMF - Faculty of Mathematics and Physics
UDC: 524.8
COBISS: 208089091 Link will open in a new window
ISSN: 1538-4357
Views: 36
Downloads: 9
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Other data

Type (COBISS): Article
Pages: A8, str. 1-16
Volume: ǂVol. ǂ973
Issue: ǂissue ǂ1
Chronology: September 2024
DOI: 10.3847/1538-4357/ad5da8
ID: 25105223
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