Papers › The GLASS-JWST Early Release Science Programme: The NIRISS Spectroscopic Catalogue
The GLASS-JWST Early Release Science Programme: The NIRISS Spectroscopic Catalogue
Peter J. Watson, Benedetta Vulcani, Tommaso Treu, Guido Roberts-Borsani, Nicolò Dalmasso, Xianlong He, Matthew A. Malkan, Takahiro Morishita, Sofía Rojas Ruiz, Yechi Zhang, Ayan Acharyya, Pietro Bergamini, Maruša Bradač, Adriano Fontana, Claudio Grillo, Tucker Jones, Danilo Marchesini, Themiya Nanayakkara, Laura Pentericci, Chanita Tubthong, Xin Wang
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We present a spectroscopic redshift catalogue of sources in the Abell 2744 cluster field, derived from JWST/NIRISS observations taken as part of the GLASS-JWST Early Release Science programme. We describe the data reduction, contamination modelling and source detection, as well as the data quality assessment, redshift determination and validation. The catalogue consists of 354 secure and 134 tentative redshifts, of which 245 are new spectroscopic redshifts, spanning a range 0.1 ≤z ≤8.2. These include 17 galaxies at the cluster redshift, one galaxy at z ≈8, and a triply-imaged galaxy at z = 2.653 ±0.002. Comparing against galaxies with existing spectroscopic redshifts z_(spec), we find a small offset of Δz = (z_(spec) - z_(NIRISS) )/(1 + z_(spec) ) = (1.3 ±1.6) ×10⁻³. We also present a forced extraction tool (pygrife) and a visualisation tool (pygcg) to the community, to aid with the reduction and classification of grism data. This catalogue will enable future studies of the spatially-resolved properties of galaxies throughout cosmic noon, including dust attenuation and star formation. As a first application of the catalogue, we discuss the spectroscopic confirmation of multiple image systems, and the identification of multiple overdensities at 1 < z < 2.7.
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