The Gas and Stellar Content of a Metal-poor Galaxy at z = 8.496 as Revealed by JWST and ALMA

Heintz, K. E.; Giménez-Arteaga, Clara; Fujimoto, Seiji; Brammer, Gabriel; Espada, Daniel; Gillman, Steven; González-López, Jorge; Greve, T. R.; Harikane, Yuichi; Hatsukade, Bunyo; Knudsen, K. K.; Koekemoer, Anton M.; Kohno, Kotaro; Kokorev, Vasily; Lee, Minju; Magdis, G.; Nelson, Erica J.; Rizzo, Francesca; Shapley, Alice E.; Strait, Victoria; Toft, Sune; Valentino, F.; Wel, Arjen van der; Vijayan, Aswin P.; Watson, Derrick G.; Bauer, F. E.; Christiansen, C. R.; N., Wilson, S.

doi:10.3847/2041-8213/acb2cf

Cited by 27 publications

(19 citation statements)

References 140 publications

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“…The measured flux in Hβ gives us an estimate of the SFR in JD1. Following the same approach as Heintz et al (2023), we assume the Case B ratio for f Hα/Hβ = 2.80 for T e = 1.6 × 10 4 K as derived from the direct analysis described in Section 5. We derive the SFR as et al 2018).…”

Section: Star Formation Ratementioning

confidence: 99%

“…The high sensitivity of the NIRSpec spectrometer on board JWST (Böker et al 2023) has enabled us to study emission-line diagnostics of galaxies at redshift z > 8 with unprecedented detail. Already the Early Release Observations (ERO) observations of SMACS J0723.3-7327 S04590 at z = 8.496 (Curti et al 2023;Heintz et al 2023) enabled the first detection at high redshift of the auroral line [O III]λ4363 and its use to derive an electron temperature T e 24,000 K. The derived metallicity for this object is 12 log O H 7 ( ) + ~. Comparison with strong emission-line diagnostics showed that this object was outside the validity range of most calibrations.…”

Section: Introductionmentioning

confidence: 99%

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The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11

Stiavelli,

Morishita,

Chiaberge

et al. 2023

ApJL

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We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1 (hereafter JD1). Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust free but is already enriched, 12 + log ( O / H ) = 7.90 − 0.05 + 0.04 . We also find that the carbon and neon abundances in JD1 are below the solar abundance ratio. Particularly the carbon under-abundance is suggestive of recent star formation where Type II supernovae have already enriched the interstellar medium (ISM) in oxygen but intermediate mass stars have not yet enriched the ISM in carbon. A recent burst of star formation is also revealed by the star formation history derived from NIRCam photometry. Our data do not reveal the presence of a significant amount of old populations, resulting in a factor of ∼7× smaller stellar mass than previous estimates. Thus, our data support the view that JD1 is a young galaxy.

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Section: Star Formation Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11

Stiavelli,

Morishita,

Chiaberge

et al. 2023

ApJL

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“…There have been multiple works on these targets, albeit always from an integrated perspective (e.g., Arellano-Córdova et al 2022;Brinchmann 2022;Carnall et al 2023;Curti et al 2022;Fujimoto et al 2022;Heintz et al 2023;Rhoads et al 2023;Schaerer et al 2022;Tacchella et al 2022;Trump et al 2023). These papers derive different stellar masses, some of them with extremely young ages of the stellar population.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Properties of Galaxies at 5 < z < 9 in the SMACS 0723 JWST ERO Field

Giménez-Arteaga

Oesch

Brammer

et al. 2023

ApJ

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We present the first spatially resolved measurements of galaxy properties in the JWST ERO SMACS 0723 field. We perform a comprehensive analysis of five 5 < z < 9 galaxies with spectroscopic redshifts from NIRSpec observations. We perform spatially resolved spectral energy distribution fitting with Bagpipes, using six NIRCam imaging bands spanning the wavelength range 0.8–5 μm. This approach allows us to study the internal structure and assembly of the first generations of galaxies. We find clear gradients both in the empirical color maps and in most of the estimated physical parameters. We find regions of considerably different specific star formation rates across each galaxy, which points to very bursty star formation happening on small scales, not galaxy-wide. The integrated light is dominated by these bursty regions, which exhibit strong line emission, with the equivalent width of [O iii]+Hβ reaching up to ∼3000–4000 Å rest frame. Studying these galaxies in an integrated approach yields extremely young inferred ages of the stellar population (<10 Myr), which outshine older stellar populations that are only distinguishable in the spatially resolved maps. This leads to inferring ∼0.5–1 dex lower stellar masses by using single-aperture photometry, when compared to resolved analyses. Such systematics would have strong implications in the shape and evolution of the stellar mass function at these early times, particularly while samples are limited to small numbers of the brightest candidates. Furthermore, the evolved stellar populations revealed in this study imply an extended process of early galaxy formation that could otherwise be hidden behind the light of the most recently formed stars.

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“…We should note that there are indeed some arguments on the data given by Labbé et al (2023). For instance, Prada et al (2023) found that their galaxy formation model can explain the UV luminosity function measured by JWST (Naidu et al 2022b;Donnan et al 2023;Harikane et al 2023) and HST (Oesch et al 2018;Bouwens et al 2021;Kauffmann et al 2022), and their prediction on star formation rate and stellar mass at z ∼ 8.5 has good match with the observation of the spectroscopically confirmed galaxies (Bouwens et al 2022;Fujimoto et al 2023;Heintz et al 2023;Williams et al 2023). So they claim that the stellar mass-to-light ratio during early epochs could not have reached such high values reported by Labbé et al (2023).…”

mentioning

confidence: 56%

Implications of the Stellar Mass Density of High-z Massive Galaxies from JWST on Warm Dark Matter

Lin,

Gong,

Yue

et al. 2023

Res. Astron. Astrophys.

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A significant excess of the stellar mass density at high redshift has been discovered from the early data release of James Webb Space Telescope ($\it{JWST}$), and it may require a high star formation efficiency. However, this will lead to large number density of ionizing photons in the epoch of reionization (EoR), so that the reionization history will be changed, which can arise tension with the current EoR observations. Warm dark matter (WDM), via the free streaming effect, can suppress the formation of small-scale structure as well as low-mass galaxies. This provides an effective way to decrease the ionizing photons when considering a large star formation efficiency in high-$z$ massive galaxies without altering the cosmic reionization history. On the other hand, the constraints on the properties of warm dark matter can be derived from the $\it JWST$ observations. In this work, we study WDM as a possible solution to reconcile the $\it JWST$ stellar mass density of high-$z$ massive galaxies and reionization history. {\color{red}We find that, the $\it JWST$ high-$z$ comoving cumulative stellar mass density alone has no significant preference for either CDM or WDM model. But using the observational data of other stellar mass density measurements and reionization history, we obtain that the WDM particle mass with $m_{\text{W}} = 0.51^{+0.22}_{-0.12}$ eV and star formation efficiency parameter $f_{*}^0>0.39$ in 2$\sigma$ confidence level can match both the $\it JWST$ high-$z$ comoving cumulative stellar mass density and the reionization history.

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The Gas and Stellar Content of a Metal-poor Galaxy at z = 8.496 as Revealed by JWST and ALMA

Cited by 27 publications

References 140 publications

The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11

The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11

Spatially Resolved Properties of Galaxies at 5 < z < 9 in the SMACS 0723 JWST ERO Field

Implications of the Stellar Mass Density of High-z Massive Galaxies from JWST on Warm Dark Matter

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