A Large Population of Faint 8 < z < 16 Galaxies Found in the First JWST NIRCam Observations of the NGDEEP Survey
| Autor: | Duncan Austin, Nathan Adams, Christopher J. Conselice, Thomas Harvey, Katherine Ormerod, James Trussler, Qiong Li, Leonardo Ferreira, Pratika Dayal, Ignas Juodžbalis |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal Letters, Vol 952, Iss 1, p L7 (2023) |
| Druh dokumentu: | article |
| ISSN: | 2041-8213 2041-8205 |
| DOI: | 10.3847/2041-8213/ace18d |
| Popis: | We present an early analysis on the search for high-redshift galaxies using the deepest public JWST imaging to date, the NGDEEP field. These data consist of six-band NIRCam imaging on the Hubble Ultra Deep Field Parallel 2 (HUDF-Par2), covering a total area of 6.3 arcmin ^2 . Based on our initial reduction of the first half of this survey, we reach 5 σ depths up to mag = 29.5–29.9 between 1 and 5 μ m. Such depths present an unprecedented opportunity to begin exploring the very early universe with JWST. As such, we find high-redshift galaxies by examining the spectral energy distribution of all F444W detections and present 16 new z > 8.5 galaxies identified using two different photometric redshift codes: LePhare and EAZY combined with other significance criteria. The highest-redshift object in our sample is at $z={15.6}_{-0.3}^{+0.4}$ , which has a blue $\beta =-{3.02}_{-0.46}^{+0.42}$ and a very low inferred stellar mass of M _* = 10 ^7.4 M _⊙ . We also discover a series of faint, low-mass dwarf galaxies with M _* < 10 ^8.5 M _⊙ at z ∼ 9 that have blue colors, flat surface brightness profiles, and small sizes |
| Databáze: | Directory of Open Access Journals |
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