分类： 天文学 >> 天文学 提交时间： 2023-02-19
Marco Castellano
Adriano Fontana
Tommaso Treu
Paola Santini
Emiliano Merlin
Nicha Leethochawalit
Michele Trenti
Uros Mestric
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
摘要： 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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