Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS [Early Results from GLASS-JWST. I: Confirmation of Lensed z >= 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS]
Articolo
Data di Pubblicazione:
2022
Citazione:
Early Results from GLASS-JWST. I: Confirmation of Lensed z ≥ 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS [Early Results from GLASS-JWST. I: Confirmation of Lensed z >= 7 Lyman-break Galaxies behind the Abell 2744 Cluster with NIRISS] / G. Roberts-Borsani, T. Morishita, T. Treu, G. Brammer, V. Strait, X. Wang, M. Bradac, A. Acebron Munoz, P. Bergamini, K. Boyett, A. Calabró, M. Castellano, A. Fontana, K. Glazebrook, C. Grillo, A. Henry, T. Jones, M. Malkan, D. Marchesini, S. Mascia, C. Mason, A. Mercurio, E. Merlin, T. Nanayakkara, L. Pentericci, P. Rosati, P. Santini, C. Scarlata, M. Trenti, E. Vanzella, B. Vulcani, C. Willott. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 938:2(2022 Oct 18), pp. L13.1-L13.7. [10.3847/2041-8213/ac8e6e]
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 iiλ1640 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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
high-redshift galaxies; star formation; cosmology; dark ages; reionization; first stars
Elenco autori:
G. Roberts-Borsani, T. Morishita, T. Treu, G. Brammer, V. Strait, X. Wang, M. Bradac, A. Acebron Munoz, P. Bergamini, K. Boyett, A. Calabró, M. Castellano, A. Fontana, K. Glazebrook, C. Grillo, A. Henry, T. Jones, M. Malkan, D. Marchesini, S. Mascia, C. Mason, A. Mercurio, E. Merlin, T. Nanayakkara, L. Pentericci, P. Rosati, P. Santini, C. Scarlata, M. Trenti, E. Vanzella, B. Vulcani, C. Willott
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