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A free-form mass model of the Hubble Frontier Fields cluster AS1063 (RXC J2248.7-4431) with over one hundred constraints

AuthorsDiego, José María ; Broadhurst, T.; Wong, Jess; Silk, Joseph; Lim, Jeremy; Zheng, Wei; Lam, Daniel; Ford, Holland C.
KeywordsDark matter
Galaxies: clusters: general
Issue Date2016
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 459(4): 3447-3459 (2016)
AbstractWe derive a free-form mass distribution for the massive cluster AS1063 (z = 0.348) using the completed optical imaging from the Hubble Frontier Fields programmme. Based on a subset of 11 multiply lensed systems with spectroscopic redshift, we produce a lens model that is accurate enough to secure new multiply lensed systems, totalling over a 100 arclets, and to estimate their redshifts geometrically. Consistency is found between this precise model and that obtained using only the subset of lensed sources with spectroscopically measured redshifts. Although a relatively large elongation of the mass distribution is apparent relative to the X-ray map, no significant offset is found between the centroid of our mass distribution and that of the X-ray emission map, suggesting a relatively relaxed state for this cluster. For the well-resolved lensed images, we provide detailed model comparisons to illustrate the precision of our model and hence the reliability of our de-lensed sources. A clear linear structure is associated with one such source extending 23 kpc in length, that could be an example of jet-induced star formation, at redshift z ≈ 3.1.
Publisher version (URL)https://doi.org/10.1093/mnras/stw865
Identifiersdoi: 10.1093/mnras/stw865
e-issn: 1365-2966
issn: 0035-8711
Appears in Collections:(IFCA) Artículos
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