CLASH: Mass Distribution in and around MACS J1206.2-0847 from a Full Cluster Lensing Analysis
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 BVRIz' imaging and our recent 16-band Hubble Space Telescope observations taken as part of the Cluster Lensing And Supernova survey with Hubble (CLASH) 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 north-west south-east (NW-SE), aligned with the cluster and its brightest galaxy shapes, showing elongation with a \sim 2:1 axis ratio in the plane of the sky. Our full-lensing mass profile exhibits a shallow profile slope dln\Sigma/dlnR\sim -1 at cluster outskirts (R>1Mpc/h), whereas the mass distribution excluding the NW-SE excess regions steepens further out, well described by the Navarro-Frenk-White form. Assuming a spherical halo, we obtain a virial mass M_{vir}=(1.1\pm 0.2\pm 0.1)\times 10^{15} M_{sun}/h and a halo concentration c_{vir} = 6.9\pm 1.0\pm 1.2 (\sim 5.7 when the central 50kpc/h is excluded), which falls in the range 4< <c> <7 of average c(M,z) predictions for relaxed clusters from recent Lambda 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, yield a cumulative gas mass fraction of 13.7^{+4.5}_{-3.0}% at 0.7Mpc/h (\approx 1.7r_{2500}), a typical value observed for high mass clusters.
Keywords
Cite
@article{arxiv.1204.3630,
title = {CLASH: Mass Distribution in and around MACS J1206.2-0847 from a Full Cluster Lensing Analysis},
author = {Keiichi Umetsu and Elinor Medezinski and Mario Nonino and Julian Merten and Adi Zitrin and Alberto Molino and Claudio Grillo and Mauricio Carrasco and Megan Donahue and Andisheh Mahdavi and Dan Coe and Marc Postman and Anton Koekemoer and Nicole Czakon and Jack Sayers and Tony Mroczkowski and Sunil Golwala and Patrick M. Koch and Kai-Yang Lin and Sandor M. Molnar and Piero Rosati and Italo Balestra and Amata Mercurio and Marco Scodeggio and Andrea Biviano and Timo Anguita and Leopoldo Infante and Gregor Seidel and Irene Sendra and Stephanie Jouvel and Ole Host and Doron Lemze and Tom Broadhurst and Massimo Meneghetti and Leonidas Moustakas and Matthias Bartelmann and Narciso Benitez and Rychard Bouwens and Larry Bradley and Holland Ford and Yolanda Jimenez-Teja and Daniel Kelson and Ofer Lahav and Peter Melchior and John Moustakas and Sara Ogaz and Stella Seitz and Wei Zheng},
journal= {arXiv preprint arXiv:1204.3630},
year = {2015}
}
Comments
Accepted by ApJ (30 pages, 17 figures), one new figure (Figure 10) added, minor text changes; a version with high resolution figures available at http://www.asiaa.sinica.edu.tw/~keiichi/upfiles/MACS1206/ms_highreso.pdf