Academic Journal
CEERS Spectroscopic Confirmation of NIRCam-selected z ≳ 8 Galaxy Candidates with JWST/NIRSpec: Initial Characterization of Their Properties
| Title: | CEERS Spectroscopic Confirmation of NIRCam-selected z ≳ 8 Galaxy Candidates with JWST/NIRSpec: Initial Characterization of Their Properties |
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| Authors: | Seiji Fujimoto, Pablo Arrabal Haro, Mark Dickinson, Steven L. Finkelstein, Jeyhan S. Kartaltepe, Rebecca L. Larson, Denis Burgarella, Micaela B. Bagley, Peter Behroozi, Katherine Chworowsky, Michaela Hirschmann, Jonathan R. Trump, Stephen M. Wilkins, L. Y. Aaron Yung, Anton M. Koekemoer, Casey Papovich, Nor Pirzkal, Henry C. Ferguson, Adriano Fontana, Norman A. Grogin, Andrea Grazian, Lisa J. Kewley, Dale D. Kocevski, Jennifer M. Lotz, Laura Pentericci, Swara Ravindranath, Rachel S. Somerville, Ricardo O. Amorín, Bren E. Backhaus, Antonello Calabrò, Caitlin M. Casey, M. C. Cooper, Vital Fernández, Maximilien Franco, Mauro Giavalisco, Nimish P. Hathi, Santosh Harish, Taylor A. Hutchison, Kartheik G. Iyer, Intae Jung, Ray A. Lucas, Jorge A. Zavala |
| Source: | The Astrophysical Journal Letters, Vol 949, Iss 2, p L25 (2023) |
| Publisher Information: | IOP Publishing, 2023. |
| Publication Year: | 2023 |
| Collection: | LCC:Astrophysics |
| Subject Terms: | Early universe, Galaxy formation, Galaxy evolution, High-redshift galaxies, Astrophysics, QB460-466 |
| More Details: | We present JWST NIRSpec spectroscopy for 11 galaxy candidates with photometric redshifts of z ≃ 9 − 13 and M _UV ∈ [ −21, −18] newly identified in NIRCam images in the Cosmic Evolution Early Release Science Survey. We confirm emission line redshifts for 7 galaxies at z = 7.762–8.998 using spectra at ∼1–5 μ m either with the NIRSpec prism or its three medium-resolution ( R ∼ 1000) gratings. For z ≃ 9 photometric candidates, we achieve a high confirmation rate of ≃90%, which validates the classical dropout selection from NIRCam photometry. No robust emission lines are identified in three galaxy candidates at z > 10, where the strong [O iii ] and H β lines would be redshifted beyond the wavelength range observed by NIRSpec, and the Ly α continuum break is not detected with the sensitivity of the current data. Compared with Hubble Space Telescope-selected bright galaxies ( M _UV ≃ −22) that are similarly spectroscopically confirmed at z ≃ 8 − 9, these NIRCam-selected galaxies are characterized by lower star formation rates (SFRs; SFR ≃ 4 M _⊙ yr ^−1 ) and lower stellar masses (≃10 ^8 M _⊙ ), but with higher specific SFR (≃40 Gyr ^−1 ), higher [O iii ]+H β equivalent widths (≃1100 Å), and elevated production efficiency of ionizing photons ( $\mathrm{log}({\xi }_{\mathrm{ion}}/\mathrm{Hz}\,{\mathrm{erg}}^{-1})\simeq 25.8$ ) induced by young stellar populations ( |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2041-8213 2041-8205 |
| Relation: | https://doaj.org/toc/2041-8205 |
| DOI: | 10.3847/2041-8213/acd2d9 |
| Access URL: | https://doaj.org/article/d96b7f0620ae434e976b23f6e84f1c0f |
| Accession Number: | edsdoj.96b7f0620ae434e976b23f6e84f1c0f |
| Database: | Directory of Open Access Journals |
| ISSN: | 20418213 20418205 |
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| DOI: | 10.3847/2041-8213/acd2d9 |
| Published in: | The Astrophysical Journal Letters |
| Language: | English |