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|Title:||The Grism Lens-amplified Survey from Space (GLASS). IV. Mass Reconstruction of the Lensing Cluster Abell 2744 from Frontier Field Imaging and GLASS Spectroscopy||Authors:||Wang, X.
Schmidt, K. B.
Brammer, G. B.
Jones, T. A.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||811||Issue:||1||First Page:||29||Abstract:||We present a strong and weak lensing reconstruction of the massive cluster Abell 2744, the first cluster for which deep Hubble Frontier Fields (HFF) images and spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS) are available. By performing a targeted search for emission lines in multiply imaged sources using the GLASS spectra, we obtain five high-confidence spectroscopic redshifts and two tentative ones. We confirm one strongly lensed system by detecting the same emission lines in all three multiple images. We also search for additional line emitters blindly and use the full GLASS spectroscopic catalog to test reliability of photometric redshifts for faint line emitters. We see a reasonable agreement between our photometric and spectroscopic redshift measurements, when including nebular emission in photometric redshift estimations. We introduce a stringent procedure to identify only secure multiple image sets based on colors, morphology, and spectroscopy. By combining 7 multiple image systems with secure spectroscopic redshifts (at 5 distinct redshift planes) with 18 multiple image systems with secure photometric redshifts, we reconstruct the gravitational potential of the cluster pixellated on an adaptive grid, using a total of 72 images. The resulting mass map is compared with a stellar mass map obtained from the deep Spitzer Frontier Fields data to study the relative distribution of stars and dark matter in the cluster. We find that the stellar to total mass ratio varies substantially across the cluster field, suggesting that stars do not trace exactly the total mass in this interacting system. The maps of convergence, shear, and magnification are made available in the standard HFF format.||Acknowledgments:||This paper is based on observations made with the NASA/ESA Hubble Space Telescope , obtained at STScI. We acknowledge support through grants HST -GO-13459, HST -GO-13177, and HST -AR-13235. We thank the anonymous referee for useful comments that helped improve the presentation of this paper. This work utilizes gravitational lensing models produced by P.I.s Bradač Ebeling, Merten, Zitrin, Sharon, and Williams funded as part of the HST Frontier Fields program conducted by STScI. M.B., K.H., and A.H. acknowledge support for this work through a Spitzer award issued by JPL/Caltech. A.H. acknowledges support by NASA Headquarters under the NASA Earth and Space Science Fellowship Program—Grant ASTRO14F- 0007. M.B. and A.H. also acknowledge support from the special funding as part of the HST Frontier Fields program conducted by STScI. STScI is operated by AURA, Inc. under NASA contract NAS 5-26555. The data were obtained from the Mikulski Archive for Space Telescopes (MAST). T.T. acknowledges support by the Packard Foundation through a Packard Research Fellowship, and thanks the Osservatorio Astronomico di Monteporzio Catone and the American Academy in Rome for their kind hospitality during the writing of this manuscript. 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). X.W. acknowledges Michael Maseda for the helpful discussions.||URI:||http://hdl.handle.net/20.500.12386/23118||URL:||https://iopscience.iop.org/article/10.1088/0004-637X/811/1/29||ISSN:||0004-637X||DOI:||10.1088/0004-637X/811/1/29||Bibcode ADS:||2015ApJ...811...29W||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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