Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS

Guido Roberts-Borsani; Takahiro Morishita; Tommaso Treu; Gabriel Brammer; Victoria Strait; Xin Wang; Marusa Bradac; Ana Acebron; Pietro Bergamini; Kristan Boyett; Antonello Calabró; Marco Castellano; Adriano Fontana; Karl Glazebrook; Claudio Grillo; Alaina Henry; Tucker Jones; Matthew Malkan; Danilo Marchesini; Sara Mascia; Charlotte Mason; Amata Mercurio; Emiliano Merlin; Themiya Nanayakkara; Laura Pentericci; Piero Rosati; Paola Santini; Claudia Scarlata; Michele Trenti; Eros Vanzella; Benedetta Vulcani; Chris Willott

doi:10.3847/2041-8213/ac8e6e

Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS

Guido Roberts-Borsani, Takahiro Morishita, Tommaso Treu, Gabriel Brammer, Victoria Strait, Xin Wang, Marusa Bradac, Ana Acebron, Pietro Bergamini, Kristan Boyett, Antonello Calabró, Marco Castellano, Adriano Fontana, Karl Glazebrook, Claudio Grillo, Alaina Henry, Tucker Jones, Matthew Malkan, Danilo Marchesini, Sara MasciaCharlotte Mason, Amata Mercurio, Emiliano Merlin, Themiya Nanayakkara, Laura Pentericci, Piero Rosati, Paola Santini, Claudia Scarlata, Michele Trenti, Eros Vanzella, Benedetta Vulcani, Chris Willott

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

We present the first search for z ≥ 7, continuum-confirmed Lyman break sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST-ERS survey. With ∼15 hr of preimaging and multiangle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, cleaning, modeling, and extraction processes) and analysis for the GLASS-JWST survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at z = 8.04 ± 0.15 and z = 7.90 ± 0.13 by means of their Lyman breaks. Fainter continuum spectra are observed in both the F150W and F200W bands, indicative of blue (−1.69 and −1.33) UV slopes and moderately bright absolute magnitudes (−20.37 and −19.68 mag). We do not detect strong Lyα in either galaxy, but do observe tentative (∼2.7-3.8σ) He ii λ1640 Å, O iii]λλ1661,1666 Å, and N iii]λλ1747,1749 Å line emission in one, suggestive of low-metallicity, star-forming systems with possible nonthermal contributions. These novel observations provide a first look at the extraordinary potential of JWST/NIRISS for confirming representative samples of bright z ≥ 7 sources in the absence of strong emission lines, and gain unprecedented insight into their contributions toward cosmic reionization.

Original language	English (US)
Article number	L13
Journal	Astrophysical Journal Letters
Volume	938
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ac8e6e
State	Published - Oct 1 2022

Bibliographical note

Funding Information:
This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program JWST-ERS-1324. We acknowledge financial support from NASA through grant JWST-ERS-1324. K.G. and T.N. acknowledge support from Australian Research Council Laureate Fellowship FL180100060. C.M. acknowledges support by the VILLUM FONDEN under grant 37459. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant DNRF140. M.B. acknowledges support from the Slovenian national research agency ARRS through grant N1-0238. This research is supported in part by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project No. CE170100013. We acknowledge financial support through grants PRIN-MIUR 2017WSCC32 and 2020SKSTHZ.

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© 2022. The Author(s). Published by the American Astronomical Society.

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Roberts-Borsani, G., Morishita, T., Treu, T., Brammer, G., Strait, V., Wang, X., Bradac, M., Acebron, A., Bergamini, P., Boyett, K., Calabró, A., Castellano, M., Fontana, A., Glazebrook, K., Grillo, C., Henry, A., Jones, T., Malkan, M., Marchesini, D., ... Willott, C. (2022). Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS. Astrophysical Journal Letters, 938(2), Article L13. https://doi.org/10.3847/2041-8213/ac8e6e

Roberts-Borsani, G, Morishita, T, Treu, T, Brammer, G, Strait, V, Wang, X, Bradac, M, Acebron, A, Bergamini, P, Boyett, K, Calabró, A, Castellano, M, Fontana, A, Glazebrook, K, Grillo, C, Henry, A, Jones, T, Malkan, M, Marchesini, D, Mascia, S, Mason, C, Mercurio, A, Merlin, E, Nanayakkara, T, Pentericci, L, Rosati, P, Santini, P, Scarlata, C, Trenti, M, Vanzella, E, Vulcani, B & Willott, C 2022, 'Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS', Astrophysical Journal Letters, vol. 938, no. 2, L13. https://doi.org/10.3847/2041-8213/ac8e6e

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title = "Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS",

abstract = "We present the first search for z ≥ 7, continuum-confirmed Lyman break sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST-ERS survey. With ∼15 hr of preimaging and multiangle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, cleaning, modeling, and extraction processes) and analysis for the GLASS-JWST survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at z = 8.04 ± 0.15 and z = 7.90 ± 0.13 by means of their Lyman breaks. Fainter continuum spectra are observed in both the F150W and F200W bands, indicative of blue (−1.69 and −1.33) UV slopes and moderately bright absolute magnitudes (−20.37 and −19.68 mag). We do not detect strong Lyα in either galaxy, but do observe tentative (∼2.7-3.8σ) He ii λ1640 {\AA}, O iii]λλ1661,1666 {\AA}, and N iii]λλ1747,1749 {\AA} line emission in one, suggestive of low-metallicity, star-forming systems with possible nonthermal contributions. These novel observations provide a first look at the extraordinary potential of JWST/NIRISS for confirming representative samples of bright z ≥ 7 sources in the absence of strong emission lines, and gain unprecedented insight into their contributions toward cosmic reionization.",

author = "Guido Roberts-Borsani and Takahiro Morishita and Tommaso Treu and Gabriel Brammer and Victoria Strait and Xin Wang and Marusa Bradac and Ana Acebron and Pietro Bergamini and Kristan Boyett and Antonello Calabr{\'o} and Marco Castellano and Adriano Fontana and Karl Glazebrook and Claudio Grillo and Alaina Henry and Tucker Jones and Matthew Malkan and Danilo Marchesini and Sara Mascia and Charlotte Mason and Amata Mercurio and Emiliano Merlin and Themiya Nanayakkara and Laura Pentericci and Piero Rosati and Paola Santini and Claudia Scarlata and Michele Trenti and Eros Vanzella and Benedetta Vulcani and Chris Willott",

note = "Funding Information: This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program JWST-ERS-1324. We acknowledge financial support from NASA through grant JWST-ERS-1324. K.G. and T.N. acknowledge support from Australian Research Council Laureate Fellowship FL180100060. C.M. acknowledges support by the VILLUM FONDEN under grant 37459. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant DNRF140. M.B. acknowledges support from the Slovenian national research agency ARRS through grant N1-0238. This research is supported in part by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project No. CE170100013. We acknowledge financial support through grants PRIN-MIUR 2017WSCC32 and 2020SKSTHZ. Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = oct,

day = "1",

doi = "10.3847/2041-8213/ac8e6e",

language = "English (US)",

volume = "938",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Early Results from GLASS-JWST. I

T2 - Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS

AU - Roberts-Borsani, Guido

AU - Morishita, Takahiro

AU - Treu, Tommaso

AU - Brammer, Gabriel

AU - Strait, Victoria

AU - Wang, Xin

AU - Bradac, Marusa

AU - Acebron, Ana

AU - Bergamini, Pietro

AU - Boyett, Kristan

AU - Calabró, Antonello

AU - Castellano, Marco

AU - Fontana, Adriano

AU - Glazebrook, Karl

AU - Grillo, Claudio

AU - Henry, Alaina

AU - Jones, Tucker

AU - Malkan, Matthew

AU - Marchesini, Danilo

AU - Mascia, Sara

AU - Mason, Charlotte

AU - Mercurio, Amata

AU - Merlin, Emiliano

AU - Nanayakkara, Themiya

AU - Pentericci, Laura

AU - Rosati, Piero

AU - Santini, Paola

AU - Scarlata, Claudia

AU - Trenti, Michele

AU - Vanzella, Eros

AU - Vulcani, Benedetta

AU - Willott, Chris

N1 - Funding Information: This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program JWST-ERS-1324. We acknowledge financial support from NASA through grant JWST-ERS-1324. K.G. and T.N. acknowledge support from Australian Research Council Laureate Fellowship FL180100060. C.M. acknowledges support by the VILLUM FONDEN under grant 37459. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant DNRF140. M.B. acknowledges support from the Slovenian national research agency ARRS through grant N1-0238. This research is supported in part by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project No. CE170100013. We acknowledge financial support through grants PRIN-MIUR 2017WSCC32 and 2020SKSTHZ. Publisher Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

PY - 2022/10/1

Y1 - 2022/10/1

N2 - We present the first search for z ≥ 7, continuum-confirmed Lyman break sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST-ERS survey. With ∼15 hr of preimaging and multiangle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, cleaning, modeling, and extraction processes) and analysis for the GLASS-JWST survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at z = 8.04 ± 0.15 and z = 7.90 ± 0.13 by means of their Lyman breaks. Fainter continuum spectra are observed in both the F150W and F200W bands, indicative of blue (−1.69 and −1.33) UV slopes and moderately bright absolute magnitudes (−20.37 and −19.68 mag). We do not detect strong Lyα in either galaxy, but do observe tentative (∼2.7-3.8σ) He ii λ1640 Å, O iii]λλ1661,1666 Å, and N iii]λλ1747,1749 Å line emission in one, suggestive of low-metallicity, star-forming systems with possible nonthermal contributions. These novel observations provide a first look at the extraordinary potential of JWST/NIRISS for confirming representative samples of bright z ≥ 7 sources in the absence of strong emission lines, and gain unprecedented insight into their contributions toward cosmic reionization.

AB - We present the first search for z ≥ 7, continuum-confirmed Lyman break sources with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, as part of the GLASS-JWST-ERS survey. With ∼15 hr of preimaging and multiangle grism exposures in the F115W, F150W, and F200W filters, we describe the general data handling (i.e., reduction, cleaning, modeling, and extraction processes) and analysis for the GLASS-JWST survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at z = 8.04 ± 0.15 and z = 7.90 ± 0.13 by means of their Lyman breaks. Fainter continuum spectra are observed in both the F150W and F200W bands, indicative of blue (−1.69 and −1.33) UV slopes and moderately bright absolute magnitudes (−20.37 and −19.68 mag). We do not detect strong Lyα in either galaxy, but do observe tentative (∼2.7-3.8σ) He ii λ1640 Å, O iii]λλ1661,1666 Å, and N iii]λλ1747,1749 Å line emission in one, suggestive of low-metallicity, star-forming systems with possible nonthermal contributions. These novel observations provide a first look at the extraordinary potential of JWST/NIRISS for confirming representative samples of bright z ≥ 7 sources in the absence of strong emission lines, and gain unprecedented insight into their contributions toward cosmic reionization.

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JO - Astrophysical Journal Letters

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Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS

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