CLASH: Mass Distribution in and around MACS J1206.2-0847 from a Full Cluster Lensing Analysis
Donahue, Megan; Broadhurst, Tom; Koch, Patrick M.; Moustakas, John; Zheng, Wei; Mroczkowski, Tony; Zitrin, Adi; Coe, Dan; Umetsu, Keiichi; Bradley, Larry; Ogaz, Sara; Anguita, Timo; Medezinski, Elinor; Postman, Marc; Carrasco, Mauricio; Koekemoer, Anton; Nonino, Mario; Molino, Alberto; Mahdavi, Andisheh; Lemze, Doron; Infante, Leopoldo; Melchior, Peter; Host, Ole; Ford, Holland; Grillo, Claudio; Rosati, Piero; Jiménez-Teja, Yolanda; Lahav, Ofer; Bartelmann, Matthias; Benítez, Narciso; Bouwens, Rychard; Jouvel, Stephanie; Kelson, Daniel; Moustakas, Leonidas; Meneghetti, Massimo; Merten, Julian; Seitz, Stella; Biviano, Andrea; Balestra, Italo; Mercurio, Amata; Sayers, Jack; Lin, Kai-Yang; Molnar, Sandor M.; Czakon, Nicole; Scodeggio, Marco; Golwala, Sunil; Seidel, Gregor; Sendra, Irene
Taiwan, United States, Italy, Germany, Spain, Denmark, Chile, United Kingdom, Netherlands
Abstract
We derive an accurate mass distribution of the galaxy cluster MACS J1206.2-0847 (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 >~ 1 Mpc h -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) × 1015 M ⊙ h -1 and a halo concentration c vir = 6.9 ± 1.0 ± 1.2 (c vir ~ 5.7 when the central 50 kpc h -1 is excluded), which falls in the range 4 <~ langcrang <~ 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 0.7 Mpc h -1(≈ 1.7 r 2500), a typical value observed for high-mass clusters.
Based in part on data collected at the Subaru Telescope, which is operated by the National Astronomical Society of Japan.