paper

Precise Strong Lensing Mass Modeling of Four Hubble Frontier Fields Clusters and a Sample of Magnified High-Redshift Galaxies

arXiv:1510.06400 · doi:10.3847/0004-637X/819/2/114

Abstract

We conduct precise strong lensing mass modeling of four Frontier Fields (HFF) clusters, Abell2744, MACSJ0416.12403, MACSJ0717.53745, and MACSJ1149.62223, for which HFF imaging observations are completed. We construct a refined sample of more than 100 multiple images for each cluster by taking advantage of the full depth HFF images, and conduct mass modeling using the software, which assumes simply parametrized mass distributions. Our mass modeling also exploits a magnification constraint from the lensed Type Ia supernova HFF14Tom for Abell2744 and positional constraints from the multiple images S1S4 of the lensed supernova SN Refsdal for MACSJ1149.62223. We find that our best-fitting mass models reproduce the observed image positions with RMS errors of arcsec, which are smaller than RMS errors in previous mass modeling that adopted similar numbers of multiple images. Our model predicts a new image of SN Refsdal with a relative time delay and magnification that are fully consistent with a recent detection of reappearance. We then construct catalogs of dropout galaxies behind the four clusters and estimate magnification factors for these dropout galaxies with our best-fitting mass models. The dropout sample from the four cluster fields contains galaxies at , about 20 of which are predicted to be magnified by a factor of more than 10. Some of the high-redshift galaxies detected in the HFF have lensing-corrected magnitudes of to . Our analysis demonstrates that the HFF data indeed offer an ideal opportunity to study faint high-redshift galaxies. All lensing maps produced from our mass modeling will be made available on the STScI website.

26 pages, 7 figures, accepted for publication in ApJ

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