Early Results from GLASS-JWST. XI. Stellar Masses and Mass-to-light Ratio of z &gt; 7 Galaxies

Santini, P.; Fontana, A.; Castellano, M.; Leethochawalit, Nicha; Trenti, Michele; Treu, Tommaso; Belfiori, D.; Birrer, Simon; Bonchi, Andrea; Merlin, E.; Mason, Charlotte; Morishita, Takahiro; Nonino, M.; Paris, D.; Polenta, G.; Rosati, P.; Yang, Lilan; Boyett, Kristan; Bradač, Maruša; Calabró, Antonello; Dressler, Alan; Glazebrook, Karl; Marchesini, Danilo; Mascia, S.; Nanayakkara, Themiya; Pentericci, L.; Roberts-Borsani, Guido; Scarlata, Claudia; Vulcani, Benedetta; Wang, Xin

doi:10.3847/2041-8213/ac9586

Cited by 57 publications

(35 citation statements)

References 35 publications

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“…Following Santini et al (2023), we measured the stellar masses M ,obs , the observed absolute UV magnitudes at 1500 Å (M 1500,obs ), the star formation rates (SFRs), and dust redden-ing E(B − V) by fitting synthetic stellar templates to the sevenband NIRCam photometry and the released HST photometry (Castellano et al 2016) with zphot (Fontana et al 2000). We adopted Bruzual & Charlot (2003) models and assumed delayed exponentially declining star formation histories -SFH(t) ∝ (t 2 /τ) • exp(−t/τ) -with τ ranging from 0.1 to 7 Gyr.…”

Section: Measurements Of Physical Parametersmentioning

confidence: 99%

Closing in on the sources of cosmic reionization: First results from the GLASS-JWST program

Mascia

Pentericci

Calabró

et al. 2023

A&A

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The escape fraction of Lyman-continuum (LyC) photons (fesc) is a key parameter for determining the sources of cosmic reionization at z ≥ 6. At these redshifts, owing to the opacity of the intergalactic medium, the LyC emission cannot be measured directly. However, LyC leakers during the epoch of reionization could be identified using indirect indicators that have been extensively tested at low and intermediate redshifts. These include a high [O III]/[O II] flux ratio, high star-formation surface density, and compact sizes. In this work, we present observations of 29 4.5 ≤ z ≤ 8 gravitationally lensed galaxies in the Abell 2744 cluster field. From a combined analysis of JWST-NIRSpec and NIRCam data, we accurately derived their physical and spectroscopic properties: our galaxies have low masses (log(M⋆)∼8.5), blue UV spectral slopes (β ∼ −2.1), compact sizes (re ∼ 0.3 − 0.5 kpc), and high [O III]/[O II] flux ratios. We confirm that these properties are similar to those characterizing low-redshift LyC leakers. Indirectly inferring the fraction of escaping ionizing photons, we find that more than 80% of our galaxies have predicted fesc values larger than 0.05, indicating that they would be considered leakers. The average predicted fesc value of our sample is 0.12, suggesting that similar galaxies at z ≥ 6 have provided a substantial contribution to cosmic reionization.

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Section: Measurements Of Physical Parametersmentioning

confidence: 99%

Closing in on the sources of cosmic reionization: First results from the GLASS-JWST program

Mascia

Pentericci

Calabró

et al. 2023

A&A

Self Cite

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“…This issue is alleviated by the LB A71, page 4 of 9 results, which reach values of the order of 10 −5 Mpc −3 mag −1 thanks to the larger volume sampled. The theoretical trends for different resolutions are in excellent agreement at all M UV values and have been compared to the latest JWST observational determinations (Santini et al 2023;Donnan et al 2023;Harikane et al 2023;Bouwens et al 2022). As expected from the previous considerations, the faint end is severely affected by the differences in the input matter power spectra at small scales (e.g., Barkana et al 2001;Maio & Viel 2015;Rudakovskyi et al 2021;Lapi et al 2022), while the bright end (at M UV −15) is substantially unchanged (this also applies to determinations at z 16, for which the trend is similar to the z 12 panel, albeit with poorer statistics) and features a converging behaviour of the different models.…”

Section: Resultsmentioning

confidence: 66%

“…Basic early-halo properties are reminiscent of dark-matter features, as demonstrated by the mass distribution of the stellar fraction, f , plotted in Fig. 3, where numerical predictions are confronted with early JWST stellar-mass determinations (Santini et al 2023) at the same cosmological epoch. Considering the reference runs, the CDM case shows a variety of masses and f values that increase almost linearly already by the first half billion years, while WDM models predict a scarcer number of primordial structures (most notably in the 2 keV scenario) with smaller f values.…”

Section: Resultsmentioning

confidence: 96%

“…The first JWST observational programmes have detected ultra-high-redshift primordial galaxies, provided stellar masses and star formation estimates up to z 12 (Santini et al 2023;Castellano et al 2022;Naidu et al 2022b;Adams et al 2023;Furtak et al 2023;Rodighiero et al 2023), hinted at little dust content at those epochs and obtained direct metallicity measurements at z 8 (Curti et al 2023;Curtis-Lake et al 2022). Furthermore, JWST data have invoked possible galaxy candidates at redshifts as high as z 14−16 (Finkelstein et al 2022;Donnan et al 2023;Atek et al 2023;Harikane et al 2023;Bouwens et al 2022).…”

Section: Introductionmentioning

confidence: 99%

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JWST high-redshift galaxy constraints on warm and cold dark matter models

Maio

Viel

2023

A&A

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Context. Warm dark matter is a possible alternative to cold dark matter to explain cosmological structure formation. Aims. We study the implications of the latest JWST data on the nature of dark matter. Methods. We compare properties of high-redshift galaxies observed by JWST with hydrodynamical simulations, in the standard cold dark matter model and in warm dark matter models with a suppressed linear matter power spectrum Results. We find that current data are neither in tension with cold dark matter nor with warm dark matter models with mWDM > 2 keV, since they probe bright and rare objects whose physical properties are similar in the different scenarios. Conclusions. We also show how two observables, the galaxy luminosity functions and the galaxy correlation function at small scales of faint objects, can be promising tools for discriminating between the different dark-matter scenarios. Further hints may come from early stellar-mass statistics and galaxy CO emission.

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“…The photometric redshifts are computed by means of the Spectral Energy Distribution (SED) fitting code zphot.exe (Fontana et al 2000). Using the same method and assumptions as in Merlin et al (2021) and Santini et al (2023), we have built the stellar library by adopting the Bruzual & Charlot (2003) models and including nebular emission lines according to Castellano et al (2014) and Schaerer & de Barros (2009).…”

Section: Imaging Datamentioning

confidence: 99%

The GLASS-JWST Early Release Science Program. III. Strong lensing model of Abell 2744 and its infalling regions

Bergamini¹,

Acebrón²,

Grillo³

et al. 2023

Preprint

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We present a new high-precision, JWST-based, strong lensing model for the galaxy cluster Abell 2744 at z = 0.3072. By combining the deep, high-resolution JWST imaging from the GLASS-JWST and UNCOVER programs and a Director's Discretionary Time program, with newly obtained VLT/MUSE data, we identify 32 multiple images from 11 background sources lensed by two external sub-clusters at distances of ∼ 160 from the main cluster. The new MUSE observations enable the first spectroscopic confirmation of a multiple image system in the external clumps. Moreover, the re-analysis of the spectro-photometric archival and JWST data yields 27 additional multiple images in the main cluster. The new lens model is constrained by 149 multiple images (∼ 66% more than in our previous Bergamini et al. 2023a model) covering an extended redshift range between 1.03 and 9.76. The subhalo mass component of the cluster includes 177 member galaxies down to m F160W = 21, 163 of which are spectroscopically confirmed. Internal velocity dispersions are measured for 85 members. The new

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Early Results from GLASS-JWST. XI. Stellar Masses and Mass-to-light Ratio of z > 7 Galaxies

Cited by 57 publications

References 35 publications

Closing in on the sources of cosmic reionization: First results from the GLASS-JWST program

Closing in on the sources of cosmic reionization: First results from the GLASS-JWST program

JWST high-redshift galaxy constraints on warm and cold dark matter models

The GLASS-JWST Early Release Science Program. III. Strong lensing model of Abell 2744 and its infalling regions

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