Clash: Mass distribution in and around MACS J1206.2-0847 from a full cluster lensing analysis

Keiichi Umetsu, Elinor Medezinski, Mario Nonino, Julian Merten, Adi Zitrin, Alberto Molino, Claudio Grillo, Mauricio Carrasco, Megan Donahue, Andisheh Mahdavi, Dan Coe, Marc Postman, Anton Koekemoer, Nicole Czakon, Jack Sayers, Tony Mroczkowski, Sunil Golwala, Patrick M. Koch, Kai Yang Lin, Sandor M. MolnarPiero Rosati, Italo Balestra, Amata Mercurio, Marco Scodeggio, Andrea Biviano, Timo Anguita, Leopoldo Infante, Gregor Seidel, Irene Sendra, Stephanie Jouvel, Ole Host, Doron Lemze, Tom Broadhurst, Massimo Meneghetti, Leonidas Moustakas, Matthias Bartelmann, Narciso Benítez, Rychard Bouwens, Larry Bradley, Holland Ford, Yolanda Jiménez-Teja, Daniel Kelson, Ofer Lahav, Peter Melchior, John Moustakas, Sara Ogaz, Stella Seitz, Wei Zheng

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


We derive an accurate mass distribution of the galaxy cluster MACSJ1206.2-0847 (z = 0.439) from a combined weak-lensing distortion, magnification, and strong-lensing analysis of wide-field Subaru BVR c I c z′ imaging and our recent 16-band Hubble Space Telescope observations taken as part of the Cluster Lensing And Supernova survey with Hubble program. We find good agreement in the regions of overlap between several weak- and strong-lensing mass reconstructions using a wide variety of modeling methods, ensuring consistency. The Subaru data reveal the presence of a surrounding large-scale structure with the major axis running approximately northwest-southeast (NW-SE), aligned with the cluster and its brightest galaxy shapes, showing elongation with a 2: 1 axis ratio in the plane of the sky. Our full-lensing mass profile exhibits a shallow profile slope dln Σ/dln R -1 at cluster outskirts (R ≳ 1Mpch -1), whereas the mass distribution excluding the NW-SE excess regions steepens farther out, well described by the Navarro-Frenk-White form. Assuming a spherical halo, we obtain a virial mass M vir = (1.1 ± 0.2 ± 0.1) × 10 15 M h -1 and a halo concentration c vir = 6.9 ± 1.0 ± 1.2 (c vir 5.7 when the central 50kpch -1 is excluded), which falls in the range 4 ≲ 〈c〉 ≲ 7 of average c(M, z) predictions for relaxed clusters from recent Λ cold dark matter simulations. Our full-lensing results are found to be in agreement with X-ray mass measurements where the data overlap, and when combined with Chandra gas mass measurements, they yield a cumulative gas mass fraction of 13.7+4.5 - 3.0% at 0.7Mpch -1( 1.7 r 2500), a typical value observed for high-mass clusters.

Original languageEnglish (US)
Article number56
JournalAstrophysical Journal
Issue number1
StatePublished - Aug 10 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • cosmology: observations
  • dark matter
  • galaxies: clusters: individual (MACS J1206.2-0847)
  • gravitational lensing: strong
  • gravitational lensing: weak


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