TY - JOUR
T1 - Early Results from GLASS-JWST. III. Galaxy Candidates at z similar to 9-15*
AU - Castellano, Marco
AU - Fontana, Adriano
AU - Treu, Tommaso
AU - Santini, Paola
AU - Merlin, Emiliano
AU - Leethochawalit, Nicha
AU - Trenti, Michele
AU - Vanzella, Eros
AU - Mestric, Uros
AU - Bonchi, Andrea
AU - Belfiori, Davide
AU - Nonino, Mario
AU - Paris, Diego
AU - Polenta, Gianluca
AU - Roberts-Borsani, Guido
AU - Boyett, Kristan
AU - Bradac, Marusa
AU - Calabro, Antonello
AU - Glazebrook, Karl
AU - Grillo, Claudio
AU - Mascia, Sara
AU - Mason, Charlotte
AU - Mercurio, Amata
AU - Morishita, Takahiro
AU - Nanayakkara, Themiya
AU - Pentericci, Laura
AU - Rosati, Piero
AU - Vulcani, Benedetta
AU - Wang, Xin
AU - Yang, Lilan
PY - 2022/10/1
Y1 - 2022/10/1
N2 - We present the results of a first search for galaxy candidates at z similar to 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 similar to 9-11, and z similar to 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) similar or equal to -21 that are unambiguously placed at z similar or equal to 10.6 and z similar or equal to 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.
AB - We present the results of a first search for galaxy candidates at z similar to 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 similar to 9-11, and z similar to 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) similar or equal to -21 that are unambiguously placed at z similar or equal to 10.6 and z similar or equal to 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.
KW - HUBBLE FRONTIER FIELDS
KW - UV LUMINOSITY FUNCTION
KW - HIGH-REDSHIFT GALAXIES
KW - PHOTOMETRIC REDSHIFTS
KW - STAR-FORMATION
KW - FAINT-END
KW - T-PHOT
KW - I.
KW - EVOLUTION
KW - POPULATION
U2 - 10.3847/2041-8213/ac94d0
DO - 10.3847/2041-8213/ac94d0
M3 - Journal article
VL - 938
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L15
ER -