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J/ApJ/812/114 Grism Lens-Amplified Survey from Space (GLASS). I. (Treu+, 2015)
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Beginning of ReadMe :J/ApJ/812/114 Grism Lens-Amplified Survey from Space (GLASS). I. (Treu+, 2015)
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The Grism Lens-Amplified Survey from Space (GLASS).
I. Survey overview and first data release.
Treu T., Schmidt K.B., Brammer G.B., Vulcani B., Wang X., Bradac M.,
Dijkstra M., Dressler A., Fontana A., Gavazzi R., Henry A.L., Hoag A.,
Huang K.-H., Jones T.A., Kelly P.L., Malkan M.A., Mason C., Pentericci L.,
Poggianti B., Stiavelli M., Trenti M., von der Linden A.
<Astrophys. J., 812, 114 (2015)>
=2015ApJ...812..114T (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Spectra, infrared ; Galaxies, IR ; Redshifts ;
Surveys
Keywords: gravitational lensing: strong
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 0.81-1.69mum 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).
Description:
In this paper we give an overview of Grism Lens Amplified Survey from
Space (GLASS; PI Treu; GO 13459) and we present the first release of
the data for MACS J0717.5+3745, the first cluster targeted by the
survey. Spectra for 1151 galaxies down to magnitude H_AB_=24 (F140W)
have been visually inspected by members of our team to ensure quality
control.
GLASS is a cycle-21 large program with the Hubble Space Telescope
(HST), targeting 10 massive clusters, including the 6 Frontier Fields,
using the WFC3 and ACS grisms. The program consists of 140 primary
orbits (with the G102 and G141 grisms; range 0.81-1.69mum) and 140
parallel orbits (with the G800L grism).