THE GRISM LENS-AMPLIFIED SURVEY FROM SPACE (GLASS). I. SURVEY OVERVIEW AND FIRST DATA RELEASE

By T. Treu, K. Schmidt, G. Brammer, B. Vulcani, Xin Wang, M. Bradač, M. Dijkstra, A. Dressler, Adriano Fontana, R. Gavazzi and 12 more. 2015

133 citations recorded by the source corpus.

We give an overview of the Grism Lens Amplified Survey from Space (GLASS), a large Hubble Space Telescope program aimed at obtaining grism spectroscopy of the fields of 10 massive clusters of galaxies at redshift z = 0.308–0.686, including the Hubble Frontier Fields (HFF). The Wide Field Camera 3 (WFC3) yields near-infrared spectra of the cluster cores covering the wavelength range 0.81–1.69 μm through grisms G102 and G141, while the Advanced Camera for Surveys in parallel mode provides G800L spectra of the infall regions of the clusters. The WFC3 spectra are taken at two almost orthogonal position angles in order to minimize the effects of confusion. After summarizing the scientific drivers of GLASS, we describe the sample selection as well as the observing strategy and data processing pipeline. We then utilize MACS J0717.5+3745, a HFF cluster and the first one observed by GLASS, to illustrate the data quality and the high-level data products. Each spectrum brighter than H AB = 23 ?> is visually inspected by at least two co-authors and a redshift is measured when sufficient information is present in the spectra. Furthermore, we conducted a thorough search for emission lines through all of the GLASS WFC3 spectra with the aim of measuring redshifts for sources with continuum fainter than H AB = 23 . ?> We provide a catalog of 139 emission-line-based spectroscopic redshifts for extragalactic sources, including three new redshifts of multiple image systems (one probable, two tentative). In addition to the data itself, we also release software tools that are helpful to navigate the data.

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Citations in the corpus

Inferences on the timeline of reionization at z ∼ 8 from the KMOS Lens-Amplified Spectroscopic Survey (2019, methodology): “We refer the reader to Schmidt et al. (2014a) and Treu et al. (2015) for full details of GLASS.”
The Universe Is Reionizing at z ∼ 7: Bayesian Inference of the IGM Neutral Fraction Using Lyα Emission from Galaxies (2017, background): “We also show the forecast for a cluster lens- ing survey (e.g., GLASS, Treu et al. 2015; Schmidt et al. 2016) assuming a simple uniform magnification factor of µ = 2 due to gravitational lensing (i.e. p(µ) = δ(µ− 2)).”
The Frontier Fields lens modelling comparison project (2016, methodology): “In a rather unique case, even time delay measurements from a serendipitously multiply imaged supernova “Refsdal” observed by the GLASS team (Treu et al. 2015) in the FFI cluster MACSJ1149.”
The Frontier Fields: Survey Design and Initial Results (2016, methodology): “Subsequent observations with the GLASS HST WFC3/IR grism GO program (Treu et al. 2015; Schmidt et al. 18 www.archive.stsci.edu/prepds/frontier/lensmodels/ 2014; see archive.stsci.edu/prepds/glass/) and new ground-based spectroscopic campaigns have greatly increased the number and accuracy of the…”