Early Results from GLASS-JWST. III. Galaxy Candidates at z ∼9–15

By M. Castellano, A. Fontana, T. Treu, P. Santini, E. Merlin, N. Leethochawalit, M. Trenti, E. Vanzella, U. Meštrić, A. Bonchi and 20 more. Astrophysical Journal Letters, 2022

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We present the results of a first search for galaxy candidates at z ∼ 9–15 on deep seven-band NIRCam imaging acquired as part of the GLASS-James Webb Space Telescope (JWST) Early Release Science Program on a flanking field of the Frontier Fields cluster A2744. Candidates are selected via two different renditions of the Lyman-break technique, isolating objects at z ∼ 9–11, and z ∼ 9–15, respectively, supplemented by photometric redshifts obtained with two independent codes. We find five color-selected candidates at z > 9, plus one additional candidate with photometric redshift z phot ≥ 9. In particular, we identify two bright candidates at M UV ≃ −21 that are unambiguously placed at z ≃ 10.6 and z ≃ 12.2, respectively. The total number of galaxies discovered at z > 9 is in line with the predictions of a nonevolving luminosity function. The two bright ones at z > 10 are unexpected given the survey volume, although cosmic variance and small number statistics limits general conclusions. This first search demonstrates the unique power of JWST to discover galaxies at the high-redshift frontier. The candidates are ideal targets for spectroscopic follow-up in Cycle-2.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/2fdd56103777b5b460196cc82e5bf6d030928749

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Citations in the corpus

The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ∼ 8.5–14.5 (2023, background): “In de ﬁ ance of expectations, several studies immediately reported the presence of bright ( m  27.5 ) galaxies at z > 10 from the CEERS and GLASS surveys ( e.g., Finkelstein et al. 2022b; Naidu et al. 2022b; Castellano et al. 2022; Donnan et al. 2023a ) .”
Evidence for heavy-seed origin of early supermassive black holes from a z ≈ 10 X-ray quasar (2023, unknown): “Data from the James Webb Space Telescope (JWST) are rapidly transforming our understanding of the early Universe by enabling the detection of large samples of faint, distant galaxies deep into the epoch of reionization.”
A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging (2022, methodology): “This is similar to the color cuts simulated by Hainline et al. (2020) and implemented by Castellano et al. (2022).”
The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 – 15 from deep JWST and ground-based near-infrared imaging (2022, background): “In addition to independently uncovering the 2 bright galaxies at redshifts 𝑧 ' 10.5 and 𝑧 ' 12.5 recently reported by Naidu et al. (2022a) and Castellano et al. (2022) from the GLASS NIRCam imaging, we here report the discovery of an additional 43 galaxies at 𝑧 > 8.5 from the combined…”
CEERS Key Paper. I. An Early Look into the First 500 Myr of Galaxy Formation with JWST (2022, background): “…released, several papers were submitted discussing not only the detection of objects at the expected redshifts of z∼ 10–11 (e.g., Adams et al. 2022; Castellano et al. 2022; Labbe et al. 2022; Naidu et al. 2022b; Whitler et al. 2023) but some candidates at z∼ 12–17 (e.g., Donnan et al. 2023,…”
A Comprehensive Study of Galaxies at z ∼ 9–16 Found in the Early JWST Data: Ultraviolet Luminosity Functions and Cosmic Star Formation History at the Pre-reionization Epoch (2022, methodology): “Castellano et al. (2022) Castellano et al. (2022) identified seven galaxy candidates at z∼ 9–12 with the color selection using the ERS GLASS data set.”
The James Webb Space Telescope Mission (2023, background): “…papers include: (1) lensed galaxies at z> 7 (Roberts-Borsani et al. 2022), (2) photometry and catalogs (Merlin et al. 2022), (3) galaxies at z> 9 (Castellano et al. 2022), (4) metallicity in low-mass galaxies at z∼ 3 (Wang et al. 2022), (5) the size–luminosity relation at z> 7 (Yang et al.…”