LENS MODELS AND MAGNIFICATION MAPS OF THE SIX HUBBLE FRONTIER FIELDS CLUSTERS

By T. Johnson, K. Sharon, M. Bayliss, M. Gladders, D. Coe, H. Ebeling. 2014

146 citations recorded by the source corpus.

We present strong-lensing models as well as mass and magnification maps for the cores of the six Hubble Space Telescope (HST) Frontier Fields galaxy clusters. Our parametric lens models are constrained by the locations and redshifts of multiple image systems of lensed background galaxies. We use a combination of photometric redshifts and spectroscopic redshifts of the lensed background sources obtained by us (for A2744 and AS1063), collected from the literature, or kindly provided by the lensing community. Using our results, we (1) compare the derived mass distribution of each cluster to its light distribution, (2) quantify the cumulative magnification power of the HST Frontier Fields clusters, (3) describe how our models can be used to estimate the magnification and image multiplicity of lensed background sources at all redshifts and at any position within the cluster cores, and (4) discuss systematic effects and caveats resulting from our modeling methods. We specifically investigate the effect of the use of spectroscopic and photometric redshift constraints on the uncertainties of the resulting models. We find that the photometric redshift estimates of lensed galaxies are generally in excellent agreement with spectroscopic redshifts, where available. However, the flexibility associated with relaxed redshift priors may cause the complexity of large-scale structure that is needed to account for the lensing signal to be underestimated. Our findings thus underline the importance of spectroscopic arc redshifts, or tight photometric redshift constraints, for high precision lens models. All products from our best-fit lens models (magnification, convergence, shear, deflection field) and model simulations for estimating errors are made available via the Mikulski Archive for Space Telescopes.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/a2f3873ee42667de0176ade61bd9413f60ea2ecc

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Citations in the corpus

Dust in the Reionization Era: ALMA Observations of a z = 8.38 Gravitationally Lensed Galaxy (2017, methodology): “Moreover a web tool11 enables us to estimate the magnification for Abell2744 YD4 from parametric high resolution models, i.e. version 3.1 of the CATS model (Richard et al. 2014), version 3 of Johnson et al. (2014), version 3 of Merten et al. (2011) and version 3 of GLAFIC (Ishigaki et al. 2015).”
The Frontier Fields: Survey Design and Initial Results (2016, methodology): “…and new ground-based spectroscopic campaigns have greatly increased the number and accuracy of the redshifts for the background lensed FF galaxies (Wang et al. 2015, Hoag et al. 2015; Johnson et al. 2014; Richard et al. 2014; Ebeling et al. 2014; Grillo et al. 2015; Balestra et al. 2015).”
The Frontier Fields lens modelling comparison project (2016, methodology): “The Johnson-Sharon models for Ares andHera were constructed using techniques similar to those in Johnson et al. (2014), using the catalogs of multiple images that were provided to the lens modelers as positonal constraints.”
Full-data Results of Hubble Frontier Fields: UV Luminosity Functions at z ∼ 6–10 and a Consistent Picture of Cosmic Reionization (2017, background): “1 for MACS1149, v1 for Abell370 and AbellS1063; Johnson et al. 2014), Williams (v3 for Abell 2744, v3.”
The extreme faint end of the UV luminosity function at z ∼ 6 through gravitational telescopes: a comprehensive assessment of strong lensing uncertainties (2018, methodology): “…which includes mass models submitted by several teams: the GLAFIC team (Oguri et al. 2010; Ishigaki et al. 2015), Bradac et al. (Bradač et al. 2005; Hoag et al. 2016), Merten & Zitrin (Merten et al. 2011; Zitrin et al. 2009, 2013), Sharon & Johnson (Johnson et al. 2014), and Diego et al. (2015).”
HUBBLE FRONTIER FIELDS FIRST COMPLETE CLUSTER DATA: FAINT GALAXIES AT z ∼ 5–10 FOR UV LUMINOSITY FUNCTIONS AND COSMIC REIONIZATION (2014, methodology): “…Mass Models Mass models of Abell 2744 are also made by the five independent groups: M. Bradač (PI), The Clusters As TelescopeS (CATS) team (Co-PI’s J.P Kneib, P. Natarajan; see Richard et al. 2014), J. Merten & A. Zitrin (CoPI’s), K. Sharon (PI; see Johnson et al. 2014), and L. Williams (PI).”
HUBBLE SPACE TELESCOPE COMBINED STRONG AND WEAK LENSING ANALYSIS OF THE CLASH SAMPLE: MASS AND MAGNIFICATION MODELS AND SYSTEMATIC UNCERTAINTIES (2014, background): “Other mass models for this cluster were published, both in the SL and WL regimes (e.g., Jauzac et al. 2012; Limousin et al. 2012; Diego et al. 2014; Richard et al. 2014; Johnson et al. 2014; Medezinski et al. 2013).”