CEERS Spectroscopic Confirmation of NIRCam-Selected z &gt; 8 Galaxy Candidates with JWST/NIRSpec: Initial Characterization of their Properties

Fujimoto, Seiji; Haro, Pablo Arrabal; Dickinson, Mark; Finkelstein, Steven L.; Kartaltepe, Jeyhan S.; Larson, Rebecca L.; Burgarella, D.; Bagley, Micaela B.; Behroozi, Peter; Chworowsky, Katherine; Hirschmann, Michaela; Trump, Jonathan R.; Wilkins, Stephen M.; Yung, L. Y. Aaron; Koekemoer, Anton M.; Papovich, Casey; Pirzkal, Nor; Ferguson, Henry C.; Fontana, A.; Grogin, Norman A.; Grazian, A.; Kewley, Lisa J.; Kocevski, Dale D.; Lotz, Jennifer M.; Pentericci, L.; Ravindranath, Swara; Somerville, Rachel S.; Amorín, R.; Backhaus, Bren E.; Calabró, Antonello; Casey, Caitlin M.; Cooper, M. C.; Franco, Maximilien; Giavalisco, Mauro; Hathi, Nimish P.; Harish, S.P.; Hutchison, Taylor A.; Iyer, Kartheik G.; Jung, Intae; Lucas, Ray A.; Zavala, Jorge A.

doi:10.48550/arxiv.2301.09482

Cited by 14 publications

(6 citation statements)

References 98 publications

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“…Spectroscopy has confirmed three high-redshift galaxies (7.66 < z < 8.50) with detections of strong nebular emission lines (14) and the temperature-sensitive [O III] 4363 Å emission line, which has been used to make direct electron temperature oxygen abundance measurements in galaxies at these redshifts (15)(16)(17)(18)(19). There has been further spectroscopic confirmation of seven galaxies from z = 7.762 to 8.998 (20).…”

mentioning

confidence: 88%

A magnified compact galaxy at redshift 9.51 with strong nebular emission lines

Williams

Kelly

Chen

et al. 2023

Science

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Ultraviolet light from early galaxies is thought to have ionized gas in the intergalactic medium. However, there are few observational constraints on this epoch, due to the faintness of those galaxies and the redshift of their optical light into the infrared. We report the observation, in James Webb Space Telescope (JWST) imaging, of a distant galaxy that is magnified by gravitational lensing. JWST spectroscopy of the galaxy, at rest-frame optical wavelengths, detects strong nebular emission lines due to oxygen and hydrogen. The measured redshift is z = 9.51 ± 0.01, corresponding to 510 million years after the Big Bang. The galaxy has a radius of 16.2 − 7.2 + 4.6 parsecs, substantially more compact than galaxies with equivalent luminosity at z ~ 6 to 8, leading to a high star formation rate surface density.

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confidence: 88%

A magnified compact galaxy at redshift 9.51 with strong nebular emission lines

Williams

Kelly

Chen

et al. 2023

Science

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“…Although early data from the James Webb Space Telescope (JWST) has already provided unprecedented insights into the interstellar medium (ISM) conditions and ionizing photon production in reionization era galaxies at z > 6 (Curtis-Lake et al 2022; Robertson et al 2022;Endsley et al 2022b;Curti et al 2023;Katz et al 2023a;Arellano-Córdova et al 2022;Trump et al 2022;Tacchella et al 2022;Sun et al 2022;Sanders et al 2023;Fujimoto et al 2023;Cameron et al 2023), placing direct constraints on the escape fraction of LyC photons ( f esc ) is impossible at z > 6 because of the increasing neutrality of the IGM that ab-E-mail: aayush.saxena@physics.ox.ac.uk sorbs virtually all LyC photons along the line of sight (e.g. Inoue et al 2014).…”

Section: Introductionmentioning

confidence: 99%

JADES: Discovery of extremely high equivalent width Lyman-alpha emission from a faint galaxy within an ionized bubble at z=7.3

Saxena¹,

Robertson²,

Bunker³

et al. 2023

Preprint

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We report the discovery of a remarkable Lyα emitting galaxy at z = 7.278, JADES-GS+53.16746-27.7720 (shortened to JADES-GS-z7-LA), with EW 0 (Lyα) ≈ 400 ± 90 Å and UV magnitude −16.7. The spectroscopic redshift is confirmed via rest-frame optical lines [O ii], Hβ and [O iii] in its JWST/NIRSpec Micro-Shutter Assembly (MSA) spectrum. The Lyα line is detected in both lower resolution (R ∼ 100) PRISM as well as medium resolution (R ∼ 1000) G140M grating spectra. The Lyα FWHM in the grating is ≈ 360 km s −1 and the line peaks within 120 km s −1 of the systemic redshift, indicative of very little neutral gas or dust within the galaxy. We estimate the Lyα escape fraction to be ∼)/Hβ ratio (R23) of 9.6 ± 2.2, consistent with low metallicity and high ionization parameters. Deep NIRCam imaging also revealed a close companion source (separated by 0.23 ), which exhibits similar photometry to that of JADES-GS-z7-LA, with a photometric excess in the F410M NIRCam image consistent with [O iii]+Hβ emission at the same redshift. The spectral energy distribution of JADES-GS-z7-LA indicates a 'bursty' star-formation history, with a low stellar mass of 10 7.15 M . The only explanation of the high EW Lyα emission seen in JADES-GS-z7-LA is if it resides in an ionized bubble with radius 3 pMpc. Owing to the faint nature of JADES-GS-z7-LA, we show that it is incapable of single-handedly ionizing a bubble large enough. Therefore, we suggest that JADES-GS-z7-LA (and possibly the companion source) may be a part of a larger overdensity, presenting direct evidence of overlapping ionized bubbles at z > 7, allowing us to study the process of reionization across both small and large scales.

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“…The results here indicate that the contamination is not negligible, even with our stringent, three-step selection, and that follow-up spectroscopic confirmation of published candidates in several studies is required for further conclusions on, e.g., the possible excess in the luminosity function at z  12 reported and discussed in various studies. As has been demonstrated by several more recent spectroscopic studies (e.g., Roberts-Borsani et al 2022b;Curtis-Lake et al 2022;Morishita et al 2022;Wang et al 2022;Williams et al 2022;Fujimoto et al 2023), JWST offers excellent ability to spectroscopically confirm high-z photometric candidates via strong optical emission lines and/or the Lyman break, within a reasonably small amount of time (20 hr).…”

Section: Appendix Number Estimate Of Low-z Interlopersmentioning

confidence: 85%

Physical Characterization of Early Galaxies in the Webb’s First Deep Field SMACS J0723.3-7327

Morishita

Stiavelli

2023

ApJL

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This paper highlights initial photometric analyses of JWST NIRCam imaging data in the sightline of SMACS0723, aiming to identify galaxies at redshift z > 7. By applying a conservative Lyman-break selection followed by photometric-redshift analysis and visual inspection, we identify four F090W-dropout and two F150W-dropout sources, three of which were recently confirmed in an independent spectroscopic analysis to z = 7.663, 7.665, and 8.499. We then supplement our sample with a photometric-redshift selection, and identify five additional candidates at 7 < z phot < 13. The NIRCam images clearly resolve all sources and reveal their subgalactic components that were not resolved/detected in the previous imaging by Hubble Space Telescope. Our spectral energy distribution analysis reveals that the selected galaxies are characterized by young stellar populations (median age of ∼50 Myr) of subsolar metallicity (∼0.2 Z ⊙) and little dust attenuation (A V ∼ 0.5). In several cases, we observe extreme Hβ+[O iii] lines being captured in the F444W band and seen as color excess, which is consistent with their observed high star formation rate surface density. Eight of the 11 sources identified in this study appear in at least one of the recent studies (Adams et al.; Atek et al.; Donnan et al.; Harikane et al.; Yan et al.) of the same fields, implying the high fidelity of our selection. We crossmatch all high-z galaxy candidates presented in the five studies with our catalog and discuss the possible causes of discrepancy in the final lists.

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CEERS Spectroscopic Confirmation of NIRCam-Selected z > 8 Galaxy Candidates with JWST/NIRSpec: Initial Characterization of their Properties

Cited by 14 publications

References 98 publications

A magnified compact galaxy at redshift 9.51 with strong nebular emission lines

A magnified compact galaxy at redshift 9.51 with strong nebular emission lines

JADES: Discovery of extremely high equivalent width Lyman-alpha emission from a faint galaxy within an ionized bubble at z=7.3

Physical Characterization of Early Galaxies in the Webb’s First Deep Field SMACS J0723.3-7327

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