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Bunker, Andrew J.; Saxena, Aayush; Cameron, Alex J.; Willott, Chris J.; Curtis-Lake, Emma; Jakobsen, Peter; Carniani, Stefano; Smit, Renske; Maiolino, Roberto; Witstok, Joris; Curti, Mirko; D’Eugenio, Francesco; Jones, Gareth C.; Ferruit, Pierre; Arribas, Santiago; Charlot, Stephane; Chevallard, Jacopo; Giardino, Giovanna; de Graaff, Anna; Looser, Tobias J.; Lützgendorf, Nora; Maseda, Michael V.; Rawle, Tim; Rix, Hans-Walter; Del Pino, Bruno Rodríguez; Alberts, Stacey; Egami, Eiichi; Eisenstein, Daniel J.; Endsley, Ryan; Hainline, Kevin; Hausen, Ryan; Johnson, Benjamin D.; Rieke, George; Rieke, Marcia; Robertson, Brant E.; Shivaei, Irene; Stark, Daniel P.; Sun, Fengwu; Tacchella, Sandro; Tang, Mengtao; Williams, Christina C.; Willmer, Christopher N. A.; Baker, William M.; Baum, Stefi; Bhatawdekar, Rachana; Bowler, Rebecca; Boyett, Kristan; Chen, Zuyi; Circosta, Chiara; Helton, Jakob M.; Ji, Zhiyuan; Kumari, Nimisha; Lyu, Jianwei; Nelson, Erica; Parlanti, Eleonora; Perna, Michele; Sandles, Lester; Scholtz, Jan; Suess, Katherine A.; Topping, Michael W.; Übler, Hannah; Wallace, Imaan E. B.; Whitler, Lily
Astronomy and astrophysics (Berlin), 09/2023, Letnik: 677Journal Article
We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate z > 10 Lyman break galaxy in the GOODS-North field with M UV = −21.5. We derive a redshift of z = 10.603 (lower than previous determinations) based on multiple emission lines in our low and medium resolution spectra over 0.7 − 5.3 μm. We significantly detect the continuum and measure a blue rest-UV spectral slope of β = −2.4. Remarkably, we see spatially extended Lyman- α in emission (despite the highly neutral intergalactic medium expected at this early epoch), offset 555 km s −1 redwards of the systemic redshift. From our measurements of collisionally excited lines of both low and high ionisation (including O II λ 3727, Ne III λ 3869, and C III λ 1909), we infer a high ionisation parameter (log U ∼ −2). We detect the rarely seen N IV λ 1486 and N III λ 1748 lines in both our low and medium resolution spectra, with other high ionisation lines seen in the low resolution spectrum, such as He II (blended with O III ) and C IV (with a possible P-Cygni profile). Based on the observed rest-UV line ratios, we cannot conclusively rule out photoionisation from an active galactic nucleus (AGN), although the high C III /He II and N III /He II ratios are compatible with a star formation explanation. If the observed emission lines are powered by star formation, then the strong N III λ 1748 observed may imply an unusually high N / O abundance. Balmer emission lines (H γ , H δ ) are also detected, and if powered by star formation rather than an AGN, we infer a star formation rate of ∼20 − 30 M ⊙ yr −1 (depending on the initial mass function) and low dust attenuation. Our NIRSpec spectroscopy confirms that GN-z11 is a remarkable galaxy with extreme properties seen 430 Myr after the Big Bang.
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