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We present a strong and weak lensing reconstruction of the massive clusterAbell 2744, the first cluster for which deep Hubble Frontier Field (HFF) imagesand spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS) areavailable. By performing a targeted search for emission lines in multiplyimaged sources using the GLASS spectra, we obtain 5 high-confidencespectroscopic redshifts and 2 tentative ones. We confirm 1 strongly lensedsystem by detecting the same emission lines in all 3 multiple images. We alsosearch for additional line emitters blindly and use the full GLASSspectroscopic catalog to test reliability of photometric redshifts for faintline emitters. We see a reasonable agreement between our photometric andspectroscopic redshift measurements, when including nebular emission inphotometric redshift estimations. We introduce a stringent procedure toidentify only secure multiple image sets based on colors, morphology, andspectroscopy. By combining 7 multiple image systems with secure spectroscopicredshifts (at 5 distinct redshift planes) with 18 multiple image systems withsecure photometric redshifts, we reconstruct the gravitational potential of thecluster pixellated on an adaptive grid, using a total of 72 images. Theresulting mass map is compared with a stellar mass map obtained from the deepSpitzer Frontier Fields data to study the relative distribution of stars anddark matter in the cluster. We find that the stellar to total mass ratio variessubstantially across the cluster field, suggesting that stars do not traceexactly the total mass in this interacting system. The maps of convergence,shear, and magnification are made available in the standard HFF format.

astrophysical journal/the astrophysical journal

The Grism Lens-Amplified Survey from Space (GLASS). IV. Mass  reconstruction of the lensing cluster Abell 2744 from frontier field imaging  and GLASS spectroscopy