1 / 12

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

merrill-jensen
Download Presentation

MS 2053.7  0449

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related