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JADES Imaging of GN-z11: Revealing the Morphology and Environment of a Luminous Galaxy 430 Myr after the Big Bang

Tacchella, S, Eisenstein, DJ, Hainline, K, Johnson, BD, Baker, WM, Helton, JM, Robertson, B, Suess, KA, Chen, Z, Nelson, E, Puskás, D, Sun, F, Alberts, S, Egami, E, Hausen, R, Rieke, G, Rieke, M, Shivaei, I, Williams, CC, Willmer, CNA , Bunker, A, Cameron, AJ, Carniani, S, Charlot, S, Curti, M, Curtis-Lake, E, Looser, TJ, Maiolino, R, Maseda, MV, Rawle, T, Rix, HW, Smit, R, Übler, H, Willott, C, Witstok, J, Baum, S, Bhatawdekar, R, Boyett, K, Danhaive, AL, de Graaff, A, Endsley, R, Ji, Z, Lyu, J, Sandles, L, Saxena, A, Scholtz, J, Topping, MW and Whitler, L (2023) JADES Imaging of GN-z11: Revealing the Morphology and Environment of a Luminous Galaxy 430 Myr after the Big Bang. Astrophysical Journal, 952 (1). ISSN 0004-637X

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We present JWST NIRCam nine-band near-infrared imaging of the luminous z = 10.6 galaxy GN-z11 from the JWST Advanced Deep Extragalactic Survey of the GOODS-N field. We find a spectral energy distribution (SED) entirely consistent with the expected form of a high-redshift galaxy: a clear blue continuum from 1.5 to 4 μm with a complete dropout in F115W. The core of GN-z11 is extremely compact in JWST imaging. We analyze the image with a two-component model, using a point source and a Sérsic profile that fits to a half-light radius of 200 pc and an index n = 0.9. We find a low-surface-brightness haze about 0.″4 to the northeast of the galaxy, which is most likely a foreground object but might be a more extended component of GN-z11. At a spectroscopic redshift of 10.60 (Bunker et al. 2023), the comparison of the NIRCam F410M and F444W images spans the Balmer jump. From population-synthesis modeling, here assuming no light from an active galactic nucleus, we reproduce the SED of GN-z11, finding a stellar mass of ∼109 M ⊙, a star formation rate of ∼20 M ⊙ yr−1, and a young stellar age of ∼20 Myr. Since massive galaxies at high redshift are likely to be highly clustered, we search for faint neighbors of GN-z11, finding nine galaxies out to ∼5 comoving Mpc transverse with photometric redshifts consistent with z = 10.6, and a tenth more tentative dropout only 3″ away. This is consistent with GN-z11 being hosted by a massive dark-matter halo (≈8 × 1010 M ⊙), though lower halo masses cannot be ruled out.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
SWORD Depositor: A Symplectic
Date Deposited: 13 Dec 2023 09:37
Last Modified: 13 Dec 2023 09:45
DOI or ID number: 10.3847/1538-4357/acdbc6
URI: https://researchonline.ljmu.ac.uk/id/eprint/22087
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