Статья

CLASH: WEAK-LENSING SHEAR-AND-MAGNIFICATION ANALYSIS OF 20 GALAXY CLUSTERS

Keiichi UmetsuInstitute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan; [email protected]Elinor MedezinskiDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAMario NoninoINAF-Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34143 Trieste, ItalyJulian MertenCahill Center for Astronomy and Astrophysics, California Institute of Technology, MS 249-17, Pasadena, CA 91125, USAMarc PostmanSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21208, USAM. MeneghettiINAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, ItalyMegan DonahueDepartment of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USANicole CzakonInstitute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan; [email protected]A. MolinoInstituto de Astrofísica de Andalucía (CSIC), E-18008 Granada, SpainStella SeitzMax-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, GermanyDaniel GruenMax-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, GermanyDoron LemzeDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAItalo BalestraINAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, ItalyNarciso BenítezInstituto de Astrofísica de Andalucía (CSIC), E-18008 Granada, SpainAndrea BivianoINAF-Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34143 Trieste, ItalyTom BroadhurstIkerbasque, Basque Foundation for Science, Alameda Urquijo, 36-5 Plaza Bizkaia, E-48011 Bilbao, SpainH. C. FordDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USAClaudio GrilloDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, DenmarkA. M. KoekemoerSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21208, USAPeter MelchiorCenter for Cosmology and Astro-Particle Physics and Department of Physics, The Ohio State University, Columbus, OH 43210, USAAmata MercurioINAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, ItalyJohn MoustakasDepartment of Physics and Astronomy, Siena College, 515 Loudon Road, Loudonville, NY 12211, USAPiero RosatiUniversità di Ferrara, Via Saragat 1, I-44122 Ferrara, ItalyAdi ZitrinCahill Center for Astronomy and Astrophysics, California Institute of Technology, MS 249-17, Pasadena, CA 91125, USA

2014en

ABI

Аннотация

We present a joint shear-and-magnification weak-lensing analysis of a sample of 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 ≾ z ≾ 0.69 selected from the Cluster Lensing And Supernova survey with Hubble (CLASH). Our analysis uses wide-field multi-color imaging, taken primarily with Suprime-Cam on the Subaru Telescope. From a stacked-shear-only analysis of the X-ray-selected subsample, we detect the ensemble-averaged lensing signal with a total signal-to-noise ratio of ≃ 25 in the radial range of 200-3500 kpc h^(–1), providing integrated constraints on the halo profile shape and concentration-mass relation. The stacked tangential-shear signal is well described by a family of standard density profiles predicted for dark-matter-dominated halos in gravitational equilibrium, namely, the Navarro-Frenk-White (NFW), truncated variants of NFW, and Einasto models. For the NFW model, we measure a mean concentration of c_(200c)=4.01^(+0.35)_(-0.32) at an effective halo mass of M_(200c)=1.34^(+0.10)_(-0.09) x 10^(15)M_☉. We show that this is in excellent agreement with Λ cold dark matter (ΛCDM) predictions when the CLASH X-ray selection function and projection effects are taken into account. The best-fit Einasto shape parameter is ɑ_E=0.191^(+0.071)_(-0.068), which is consistent with the NFW-equivalent Einasto parameter of ~0.18. We reconstruct projected mass density profiles of all CLASH clusters from a joint likelihood analysis of shear-and-magnification data and measure cluster masses at several characteristic radii assuming an NFW density profile. We also derive an ensemble-averaged total projected mass profile of the X-ray-selected subsample by stacking their individual mass profiles. The stacked total mass profile, constrained by the shear+magnification data, is shown to be consistent with our shear-based halo-model predictions, including the effects of surrounding large-scale structure as a two-halo term, establishing further consistency in the context of the ΛCDM model.

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Идентификаторы

DOI: 10.1088/0004-637x/795/2/163

Цитирования и источники

Цитирований: 2Использованных источников: 0

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