Journal Article

Non-parametric strong lens inversion of SDSS J1004+4112

J. Liesenborgs, S. De Rijcke, H. Dejonghe and P. Bekaert

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 397, issue 1, pages 341-349
Published in print July 2009 | ISSN: 0035-8711
Published online July 2009 | e-ISSN: 1365-2966 | DOI:
Non-parametric strong lens inversion of SDSS J1004+4112

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In this article, we study the well-known strong lensing system SDSS J1004+4112. Not only does it host a large-separation lensed quasar with measured time-delay information, but several other lensed galaxies have been identified as well. A previously developed strong lens inversion procedure that is designed to handle a wide variety of constraints is applied to this lensing system and compared to results reported in other works. Without the inclusion of a tentative central image of one of the galaxies as a constraint, we find that the model recovered by the other constraints indeed predicts an image at that location. An inversion which includes the central image provides tighter constraints on the shape of the central part of the mass map. The resulting model also predicts a central image of a second galaxy where indeed an object is visible in the available Advanced Camera for Surveys images. We find masses of 2.5 × 1013 and 6.1 × 1013 M within a radius of 60 and 110 kpc, respectively, confirming the results from other authors. The resulting mass map is compatible with an elliptical generalization of a projected NFW profile, with rs= 58+21−13 arcsec and cvir= 3.91 ± 0.74. The orientation of the elliptical NFW profile closely follows the orientation of the central cluster galaxy and the overall distribution of cluster members.

Keywords: gravitational lensing; methods: data analysis; galaxies: clusters: individual: SDSS J1004+4112; dark matter

Journal Article.  6151 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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