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 et al, 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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Abstract

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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