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http://hdl.handle.net/20.500.12386/23120
Titolo: | The Grism Lens-Amplified Survey from Space (GLASS). I. Survey Overview and First Data Release | Autori: | Treu, T. Schmidt, K. B. Brammer, G. B. Vulcani, Benedetta Wang, X. Bradač, M. Dijkstra, M. Dressler, A. FONTANA, Adriano Gavazzi, R. Henry, A. L. Hoag, A. Huang, K.-H. Jones, T. A. Kelly, P. L. Malkan, M. A. Mason, C. PENTERICCI, Laura POGGIANTI, Bianca Maria Stiavelli, M. Trenti, M. Linden, A. von der |
Data pubblicazione: | 2015 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 812 | Fascicolo: | 2 | Da pagina:: | 114 | Abstract: | 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}<SUB>{{AB</SUB>}}=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}<SUB>{{AB</SUB>}}=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. | Acknowledgments: | Support for GLASS ( HST -GO-13459) was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. We are very grateful to the staff of the Space Telescope for their assistance in planning, scheduling and executing the observations, and in setting up the GLASS public release website. We thank the referee for helpful suggestions that improved the paper. T.T. gratefully acknowledges the hospitality of the American Academy in Rome and of the Observatorio di Monteporzio Catone, where parts of this manuscript were written. B.V. acknowledges the support from the World Premier International Research Center Initiative (WPI), MEXT, Japan and the Kakenhi Grant-in-Aid for Young Scientists (B) (26870140) from the Japan Society for the Promotion of Science (JSPS). | URI: | http://hdl.handle.net/20.500.12386/23120 | ISSN: | 0004-637X | DOI: | 10.1088/0004-637X/812/2/114 | Bibcode ADS: | 2015ApJ...812..114T | Fulltext: | open |
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