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Title: Strong-lensing analysis of MS 1358.4+6245: New multiple images and implications for the well-resolved z=4.92 galaxy
Authors: Zitrin, Adi
Broadhurst, Tom
Coe, Dan
Benitez, Narciso
Rephaeli, Yoel
Ford, Holland
Umetsu, Keiichi
Issue Date: 2011
Abstract: We present a strong-lensing analysis of the galaxy cluster MS 1358.4+6245 (z = 0.33), in deep six-band HST/ACS imaging. In addition to the well-studied system at z = 4.92, our modelling method uncovers 19 new multiply lensed images belonging to seven background sources, so that a total of 23 images and their redshifts are used to accurately constrain the inner mass distribution. We derive a relatively shallow inner mass profile, d log Sigma/d log r similar or equal to -0.33 +/- 0.05 (r < 200 kpc), with a much higher magnification than estimated previously by models constrained only by the z = 4.92 system. Using these many new images we can apply a non-parametric adaptive-grid method, which also yields a shallow mass profile without prior assumptions, strengthening our conclusions. The total magnification of the z(s) = 4.92 galaxy is high, about a similar to 100 times over its four images, so that the inferred source size, luminosity and star formation rate are about similar to 5 times smaller than previous estimates, corresponding to a dwarf-sized galaxy of radius similar or equal to 1 kpc. A detailed image of the interior morphology of the source is generated with a high effective resolution of only similar or equal to 50 pc, thanks to the high magnification and to the declining angular diameter distance above z similar to 1.5 for the standard cosmology, so that this image apparently represents the best resolved object known at high redshift.
Notes: [Zitrin, Adi; Rephaeli, Yoel] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel. [Broadhurst, Tom] Univ Basque Country, Dept Theoret Phys, UPV EHU, Leioa, Spain. [Broadhurst, Tom] IKERBASQUE, Basque Fdn Sci, Bilbao 48011, Spain. [Coe, Dan] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA. [Liesenborgs, Jori] Univ Hasselt, Expertisectr Digitale Media, B-3590 Diepenbeek, Belgium. [Benitez, Narciso] CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain. [Ford, Holland] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. [Umetsu, Keiichi] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan.
URI: http://hdl.handle.net/1942/11994
DOI: 10.1111/j.1365-2966.2011.18252.x
ISI #: 000290487700022
ISSN: 0035-8711
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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