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MS 2053.7  0449

MS 2053.7  0449. José A. de Diego 1 Tomás Verdugo 1 Marceau Limousin 2. 1 Institute of Astronomy – UNAM, Mexico 2 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark. Contents. Introduction Observations & Data reduction Lens model Results Conclusions

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MS 2053.7  0449

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  1. MS 2053.70449 José A. de Diego1 Tomás Verdugo1 Marceau Limousin2 1Institute of Astronomy – UNAM, Mexico 2Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark

  2. Contents • Introduction • Observations & Data reduction • Lens model • Results • Conclusions • Based on • Verdugo, de Diego & Limousin 2007 • arXiv0704.3012v1 • ApJ in press MS 2053.7-0449

  3. Introduction • Description • Not very optically rich • Galaxy population and double cluster • Tran et al. 2005 • Velocity dispersion • Low X-ray luminosity • z = 0.583 • Lensing • Arcs • Luppino & Gioia 1992 • Only arc A has a measured z=3.146 • Weak lensing • Hoekstra et al 2002 MS 2053.7-0449

  4. Observations & Data Reduction • HST • Multimission Archive (MAST) • WFPC • F814W 2600 s • F702W 2400 s • Arcs • Polygonal apertures • Galaxies • SExtractor • Bertin & Arnauts 1996 • Magnitudes and geometry MS 2053.7-0449

  5. Lens model • LENSTOOL • Kneib 1993 • BAYESIS • Bayesian Markov Chain Monte Carlo • Jullo et al. 2007, astro-ph 0706.0048 • Dark matter halos • Pseudo-elliptical NFW • Golse & Kneib 2002 • Galaxies • 23 individual galaxies • Elliptical Singular Isothermal Spheres • ESIS • Blandford & Kochaneck 1987 MS 2053.7-0449

  6. Results - 1 • Model for Arc A • Are Arcs A & B related? • Lack of specularity • Proximity to a Caustic Line? • A 383 (Smith et al. 2005) • Spherical NFW + 23 ESIS • Two counter-images • One magnitude dimmer than Arc A • Evidence that Arcs A &B are related • A demagnified image MS 2053.7-0449

  7. Results - 2 • Pseudo-elliptical NFW models • Single cluster with Arcs A & B • Predicts a third counter-image C • A possible candidate • 6” to the North MS 2053.7-0449

  8. Results - 3 • Single cluster with Arcs A, B & C • Two solutions in the XY-space MS 2053.7-0449

  9. Result - 4 • Double cluster with Arcs A,B & C • Projected surface densities • Projected mass vs. distance from the BCG Total Galaxies Cluster. 1 Cluster 2 MS 2053.7-0449

  10. MS 2053.7-0449

  11. Conclusions • Mass distribution • Elongated mass profile • Bimodality • Double cluster • Third image • Needs spectroscopic confirmation MS 2053.7-0449

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