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Early results from GLASS-JWST. III: Galaxy candidates at z$\sim$9-15

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arxiv 2207.09436 v2 pith:M3UQP3H4 submitted 2022-07-19 astro-ph.GA

Marco Castellano , Adriano Fontana , Tommaso Treu , Paola Santini , Emiliano Merlin , Nicha Leethochawalit , Michele Trenti , Uros Mestric
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Eros Vanzella Andrea Bonchi Davide Belfiori Mario Nonino Diego Paris Gianluca Polenta Guido Roberts-Borsani Kristan Boyett Marusa Bradac Antonello Calabro Karl Glazebrook Claudio Grillo Sara Mascia Charlotte Mason Amata Mercurio Takahiro Morishita Themiya Nanayakkara Laura Pentericci Piero Rosati Benedetta Vulcani Xin Wang Lilan Yang
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abstract

We present the results of a first search for galaxy candidates at z$\sim$9--15 on deep seven-bands NIRCam imaging acquired as part of the GLASS-JWST Early Release Science Program on a flanking field of the Frontier Fields cluster A2744. Candidates are selected via two different renditions of the Lyman-break technique, isolating objects at z$\sim$9-11, and z$\sim$9-15, respectively, supplemented by photometric redshifts obtained with two independent codes. We find five color-selected candidates at z$>$9, plus one additional candidate with photometric redshift z$_{phot}\geq$9. In particular, we identify two bright candidates at $M_{UV}\simeq -21$ that are unambiguously placed at $z\simeq 10.6$ and $z\simeq 12.2$, respectively. The total number of galaxies discovered at $z>9$ is in line with the predictions of a non-evolving LF. 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$-2$.

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Cited by 3 Pith papers

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  1. A GLIMPSE of the 99%: a census of the faintest galaxies during the epoch reionization and its implications for galaxy formation models

    astro-ph.GA 2026-04 unverdicted novelty 6.0 of 10

    The UV luminosity function at z~7 rises steeply with slope alpha=-1.98 to M_UV=-12.3 with no turnover, indicating faint galaxies dominate the ionizing photon budget during reionization.

  2. Dark Secrets of Baryons: Illuminating Dark Matter-Baryon Interactions with JWST

    hep-ph 2025-11 conditional novelty 5.0 of 10

    JWST ultraviolet luminosity function data currently provide the strongest upper limits on velocity-dependent (∝v^{-2}) dark matter–proton scattering for sub-GeV dark matter.

  3. Raising the reionization optical depth with inflationary CMB features

    astro-ph.CO 2026-06 unverdicted novelty 4.0 of 10

    Marginalizing over generalized slow-roll inflationary templates for the CMB low-power feature raises the 95% upper limit on τ to 0.075 (Planck) or 0.082 (all CMB+BAO), resolving incompatibility with lower bounds.

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