%0 Generic %1 robertsborsani2022early %A Roberts-Borsani, Guido %A Morishita, Takahiro %A Treu, Tommaso %A Brammer, Gabriel %A Strait, Victoria %A Wang, Xin %A Bradac, Marusa %A Acebron, Ana %A Bergamini, Pietro %A Boyett, Kristan %A Calabró, Antonello %A Castellano, Marco %A Fontana, Adriano %A Glazebrook, Karl %A Grillo, Claudio %A Henry, Alaina %A Jones, Tucker %A Malkan, Matthew %A Marchesini, Danilo %A Mascia, Sara %A Mason, Charlotte %A Mercurio, Amata %A Merlin, Emiliano %A Nanayakkara, Themiya %A Pentericci, Laura %A Rosati, Piero %A Santini, Paola %A Scarlata, Claudia %A Trenti, Michele %A Vanzella, Eros %A Vulcani, Benedetta %A Willott, Chris %D 2022 %K library %T Early Results from GLASS-JWST. I: Confirmation of Lensed $z\geqslant7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS %U http://arxiv.org/abs/2207.11387 %X We present the first $z\geqslant7$ results of the JWST GLASS-ERS survey with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster. With $\sim15$ hrs of pre-imaging and multi-angle 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 survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at $z=8.04\pm0.15$ and $z=7.90\pm0.13$ 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 Ly$\alpha$ in either galaxy, but do observe tentative ($\sim2.7-3.8\sigma$) He II$łambda$1640 A, O III$łambdałambda$1661,1666 A, and N III$łambdałambda$1747,1749 A line emission in one, suggestive of low metallicity, star-forming systems with possible non-thermal contributions. These novel observations provide a first look at the extraordinary potential of JWST NIRISS for confirming unbiased samples of bright $z\geqslant7$ sources in the absence of strong emission lines, and gain unprecedented insight into their contributions towards cosmic reionization.

@misc{robertsborsani2022early, abstract = {We present the first $z\geqslant7$ results of the JWST GLASS-ERS survey with NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster. With $\sim15$ hrs of pre-imaging and multi-angle 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 survey. We showcase the power of JWST to peer deep into reionization, when most intergalactic hydrogen is neutral, by confirming two galaxies at $z=8.04\pm0.15$ and $z=7.90\pm0.13$ 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 Ly$\alpha$ in either galaxy, but do observe tentative ($\sim2.7-3.8\sigma$) He II$\lambda$1640 A, O III]$\lambda\lambda$1661,1666 A, and N III]$\lambda\lambda$1747,1749 A line emission in one, suggestive of low metallicity, star-forming systems with possible non-thermal contributions. These novel observations provide a first look at the extraordinary potential of JWST NIRISS for confirming unbiased samples of bright $z\geqslant7$ sources in the absence of strong emission lines, and gain unprecedented insight into their contributions towards cosmic reionization.}, added-at = {2022-07-26T10:50:01.000+0200}, author = {Roberts-Borsani, Guido and Morishita, Takahiro and Treu, Tommaso and Brammer, Gabriel and Strait, Victoria and Wang, Xin and Bradac, Marusa and Acebron, Ana and Bergamini, Pietro and Boyett, Kristan and Calabró, Antonello and Castellano, Marco and Fontana, Adriano and Glazebrook, Karl and Grillo, Claudio and Henry, Alaina and Jones, Tucker and Malkan, Matthew and Marchesini, Danilo and Mascia, Sara and Mason, Charlotte and Mercurio, Amata and Merlin, Emiliano and Nanayakkara, Themiya and Pentericci, Laura and Rosati, Piero and Santini, Paola and Scarlata, Claudia and Trenti, Michele and Vanzella, Eros and Vulcani, Benedetta and Willott, Chris}, biburl = {https://www.bibsonomy.org/bibtex/2b86e21144fdc4778e34ee3f742edeb5b/gpkulkarni}, description = {Early Results from GLASS-JWST. I: Confirmation of Lensed $z\geqslant7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS}, interhash = {6d05383cbb1ab7d29c3198e016c06e08}, intrahash = {b86e21144fdc4778e34ee3f742edeb5b}, keywords = {library}, note = {cite arxiv:2207.11387Comment: Submitted to ApJL. 10 pages, 3 figures, 1 table}, timestamp = {2022-07-26T10:50:01.000+0200}, title = {Early Results from GLASS-JWST. I: Confirmation of Lensed $z\geqslant7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS}, url = {http://arxiv.org/abs/2207.11387}, year = 2022 }