期刊
NATURE ASTRONOMY
卷 5, 期 3, 页码 256-+出版社
NATURE RESEARCH
DOI: 10.1038/s41550-020-01275-y
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资金
- National Science Foundation of China [11721303, 11890693, 11991052]
- National Key R&D Program of China [2016YFA0400702, 2016YFA0400703]
- Chinese Academy of Sciences (CAS) through a China-Chile Joint Research Fund [1503]
- JSPS [15H03645]
- W. M. Keck Foundation
- Grants-in-Aid for Scientific Research [15H03645] Funding Source: KAKEN
GN-z11, the most distant galaxy known to date, shows strong [C III] and C III] emission lines possibly originating from an active galactic nucleus or enhanced carbon abundance, indicating rapid build-up of stellar mass.
GN-z11 was photometrically selected as a luminous star-forming galaxy candidate at redshift z > 10 on the basis of Hubble Space Telescope imaging data(1). Follow-up Hubble Space Telescope near-infrared grism observations detected a continuum break that was explained as the Ly alpha break corresponding to z=11.09(-0.12)(+0.08) (ref.(2)). However, its accurate redshift remained unclear. Here we report a probable detection of three ultraviolet emission lines from GN-z11, which can be interpreted as the [C III] lambda 1907, C III] lambda 1909 doublet and O III] lambda 1666 at z = 10.957 +/- 0.001 (when the Universe was only similar to 420 Myr old, or similar to 3% of its current age). This is consistent with the redshift of the previous grism observations, supporting GN-z11 as the most distant galaxy known to date. Its ultraviolet lines probably originate from dense ionized gas that is rarely seen at low redshifts, and its strong [C III] and C III] emission is partly due to an active galactic nucleus or enhanced carbon abundance. GN-z11 is luminous and young, yet moderately massive, implying a rapid build-up of stellar mass in the past. Future facilities will be able to find the progenitors of such galaxies at higher redshift and probe the cosmic epoch at the beginning of reionization.
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