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

Castellano, Marco and Fontana, Adriano and Treu, Tommaso and Santini, Paola and Merlin, Emiliano and Leethochawalit, Nicha and Trenti, Michele and Vanzella, Eros and Mestric, Uros and Bonchi, Andrea and Belfiori, Davide and Nonino, Mario and Paris, Diego and Polenta, Gianluca and Roberts-Borsani, Guido and Boyett, Kristan and Bradač, Maruša and Calabrò, Antonello and Glazebrook, Karl and Grillo, Claudio and Mascia, Sara and Mason, Charlotte and Mercurio, Amata and Morishita, Takahiro and Nanayakkara, Themiya and Pentericci, Laura and Rosati, Piero and Vulcani, Benedetta and Wang, Xin and Yang, Lilan (2022) Early Results from GLASS-JWST. III. Galaxy Candidates at z ∼9-15*. Astrophysical Journal Letters, 938 (2). Art. No. L15. ISSN 2041-8205. doi:10.3847/2041-8213/ac94d0.

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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.

Item Type:Article
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URLURL TypeDescription data
Castellano, Marco0000-0001-9875-8263
Fontana, Adriano0000-0003-3820-2823
Treu, Tommaso0000-0002-8460-0390
Santini, Paola0000-0002-9334-8705
Merlin, Emiliano0000-0001-6870-8900
Leethochawalit, Nicha0000-0003-4570-3159
Trenti, Michele0000-0001-9391-305X
Vanzella, Eros0000-0002-5057-135X
Mestric, Uros0000-0002-0441-8629
Bonchi, Andrea0000-0002-2667-5482
Nonino, Mario0000-0001-6342-9662
Paris, Diego0000-0002-7409-8114
Polenta, Gianluca0000-0003-4067-9196
Roberts-Borsani, Guido0000-0002-4140-1367
Boyett, Kristan0000-0003-4109-304X
Bradač, Maruša0000-0001-5984-0395
Calabrò, Antonello0000-0003-2536-1614
Glazebrook, Karl0000-0002-3254-9044
Grillo, Claudio0000-0002-5926-7143
Mascia, Sara0000-0002-9572-7813
Mason, Charlotte0000-0002-3407-1785
Mercurio, Amata0000-0001-9261-7849
Morishita, Takahiro0000-0002-8512-1404
Nanayakkara, Themiya0000-0003-2804-0648
Pentericci, Laura0000-0001-8940-6768
Rosati, Piero0000-0002-6813-0632
Vulcani, Benedetta0000-0003-0980-1499
Wang, Xin0000-0002-9373-3865
Yang, Lilan0000-0002-8434-880X
Additional Information:This work is based on observations made with the NASA/ESA/Canadian Space Agency James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program JWST-ERS-1324. The JWST data used in this paper can be found on MAST: 10.17909/fqaq-p393. We acknowledge financial support from NASA through grants JWST-ERS-1342. K.G. and T.N. acknowledge support from Australian Research Council Laureate Fellowship FL180100060. C.M. acknowledges support by the VILLUM FONDEN under grant 37459. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant DNRF140. We acknowledge support from INAF Minigrant "Reionization and fundamental cosmology with high-redshift galaxies." We thank Pascal Oesch and Rohan Naidu for the useful feedback and discussion.
Funding AgencyGrant Number
NASANAS 5-03127
Australian Research CouncilFL180100060
Villum Foundation37459
Danish National Research FoundationDNRF140
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20221031-575177800.24
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117662
Deposited By: Research Services Depository
Deposited On:09 Nov 2022 19:59
Last Modified:11 Nov 2022 18:09

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