z ∼ 2–9 Galaxies Magnified by the Hubble Frontier Field Clusters. I. Source Selection and Surface Density–Magnification Constraints from &gt;2500 Galaxies

Illingworth, G. D.; Ellis, Richard S.; Oesch, Pascal; Paulino-Afonso, Ana; Ribeiro, B.; Stefanon, Mauro

doi:10.3847/1538-4357/ac618c

Cited by 43 publications

(74 citation statements)

References 96 publications

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“…Finally, we note that the highest amplitudes of the number counts are predicted by DELPHI and FLARES. The DELPHI model being an upper limit is perhaps not surprising since it has been base-lined against the most recent dust estimates from the REBELS (Reionization Era Bright Emission Line Survey) ALMA large program (Bouwens et al 2022). As shown in previous works (Dayal et al 2022), a number of REBELS sources show exceedingly high dust-to-stellar mass ratios leading to a significant attenuation of the UV light; this requires high SFR to be able to reproduce high-𝑧 observables.…”

Section: Comparisons To Predictions From Theorymentioning

confidence: 81%

Discovery and properties of ultra-high redshift galaxies ($9

Adams¹,

Conselice²,

Ferreira³

et al. 2022

Preprint

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We present a reduction and analysis of the James Webb Space Telescope (JWST) SMACS 0723 field to conduct a search for ultra-high-redshift galaxies (9 < 𝑧 < 12) present within the Epoch of Reionization. We use a combination of photometric redshifts and spectral energy distribution (SED) modelling-based selection criteria to optimise sample completeness while minimising contamination. We find four 𝑧 > 9 candidate galaxies which have not previously been identified, with one object at 𝑧 = 11.5, and another which is possibly a close pair of galaxies. These sources are fairly bright with 𝑚 277 ∼ 26 − 28. A significant fraction of these sources show evidence for Balmer-breaks or extreme emission lines from H𝛽 and [OIII], demonstrating that the stellar populations could be quite advanced in age or very young depending on the exact cause of the F444W excess. We discuss the stellar masses and resolved structures of these early galaxies and find that the Sérsic indices reveal a mixture of light concentration levels, but that the sizes of all our systems are exceptionally small in general with < 0.5 kpc. These systems have stellar masses M * ∼ 10 9.5 M with our 𝑧 ∼ 11.5 candidate a dwarf galaxy with a stellar mass M * ∼ 10 7.9 M These candidate ultra high-redshift galaxies are excellent targets for future NIRSpec observations to understand better their physical nature.

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Section: Comparisons To Predictions From Theorymentioning

confidence: 81%

Discovery and properties of ultra-high redshift galaxies ($9

Adams¹,

Conselice²,

Ferreira³

et al. 2022

Preprint

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“…The empty purple pentagons show the recently identified candidates from JWST in the GLASS parallel field by Naidu et al (2022). The empty blue circles show photometric redshift galaxies while the solid circles represent spectroscopically confirmed galaxies compiled from Bouwens et al (2022).…”

Section: Discussionmentioning

confidence: 99%

Revealing Galaxy Candidates out to $z \sim 16$ with JWST Observations of the Lensing Cluster SMACS0723

Atek¹,

Shuntov²,

Furtak³

et al. 2022

Preprint

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One of the main goals of the JWST is to study the first galaxies in the Universe. We present a systematic photometric analysis of very distant galaxies in the first JWST deep field towards the massive lensing cluster SMACS0723. As a result, we report the discovery of two galaxy candidates at 𝑧 ∼ 16, only 250 million years after the Big Bang. We also identify two candidates at 𝑧 ∼ 12 and 11 candidates at 𝑧 ∼ 10 − 11. Our search extended out to 𝑧 21 by combining color information across seven NIRCam and NIRISS filters. By modelling the Spectral Energy Distributions (SEDs) with EAZY and BEAGLE, we test the robustness of the photometric redshift estimates. While their intrinsic (un-lensed) luminosity is typical of the characteristic luminosity L * at 𝑧 > 10, our high-redshift galaxies typically show small sizes and their morphologies are consistent with disks in some cases. The highest-redshift candidates have extremely blue UV-continuum slopes −3 < 𝛽 < −2.5, young ages ∼ 10 − 100 Myr, and stellar masses log(𝑀 ★ /M ) = 8.4 − 8.8 inferred from their SED modeling which indicate a rapid build-up of their stellar mass. Our search clearly demonstrates the capabilities of JWST to uncover robust photometric candidates up to very high redshifts, and peer into the formation epoch of the first galaxies.

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“…This translates into effective apertures for JWST of ≈ 200 meters! Even without the ultra-high magnification boosts near the critical lines, SL has allowed us to probe several magnitudes deeper than blank fields, i. e., down to rest-frame UV luminosities M UV −13 magnitudes (Bouwens et al 2017(Bouwens et al , 2022aLivermore et al 2017;Atek et al 2018;Ishigaki et al 2018) and stellar masses M 10 6 M (Bhatawdekar et al 2019;Kikuchihara et al 2020;Furtak et al 2021;Strait et al 2021). With the redder wavelength range, greater sensitivity, and resolving power of the JWST, we can expect many more galaxies at even higher redshifts to be detected in the coming months.…”

Section: Introductionmentioning

confidence: 99%

Unscrambling the lensed galaxies in JWST images behind SMACS0723

Pascale¹,

Frye²,

Diego³

et al. 2022

Preprint

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The first deep field images from the James Webb Space Telescope (JWST) of the galaxy cluster SMACS J0723.3-7327 reveal a wealth of new lensed images at uncharted infrared wavelengths, with unprecedented depth and resolution. Here we securely identify 14 new sets of multiply imaged galaxies totalling 42 images, adding to the five sets of bright and multiply-imaged galaxies already known from Hubble Space Telescope data. We find examples of arcs crossing critical curves, allowing detailed community follow-up, such as JWST spectroscopy for precise redshift determinations, and measurements of the chemical abundances and of the detailed internal gas dynamics of very distant, young galaxies. One such arc contains compact knots of magnification µ ∼750, and features a microlensed transient. We also detect an Einstein cross candidate only visible thanks to JWST's superb resolution. Our parametric lens model is available through the following link a) , and will be regularly updated using additional spectroscopic redshifts. The model reproduces the multiple images to better than an rms of 0.5 , and allows for accurate magnification estimates of high-redshift galaxies. The intracluster light extends beyond the cluster members, exhibiting large-scale features that suggest a significant past dynamical disturbance. This work represents a first taste of the enhanced power JWST will have for lensing-related science.

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z ∼ 2–9 Galaxies Magnified by the Hubble Frontier Field Clusters. I. Source Selection and Surface Density–Magnification Constraints from >2500 Galaxies

Cited by 43 publications

References 96 publications

Discovery and properties of ultra-high redshift galaxies ($9

Discovery and properties of ultra-high redshift galaxies ($9

Revealing Galaxy Candidates out to $z \sim 16$ with JWST Observations of the Lensing Cluster SMACS0723

Unscrambling the lensed galaxies in JWST images behind SMACS0723

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