Mass distribution in the core of MACS J1206 Robust modeling from an exceptionally large sample of central multiple images

被引：54

作者：

Caminha, G. B. ^{[1
,2
]}

Grillo, C. ^{[3
,4
]}

Rosati, P. ^{[1
,2
]}

Meneghetti, M. ^{[2
,5
]}

Mercurio, A. ^{[6
]}

Ettori, S. ^{[2
,5
]}

Balestra, I. ^{[7
,8
]}

Biviano, A. ^{[8
]}

Umetsu, K. ^{[9
]}

Vanzella, E. ^{[2
]}

Annunziatella, M. ^{[8
]}

Bonamigo, M. ^{[4
]}

Delgado-Correal, C. ^{[1
]}

Girardi, M. ^{[8
,10
]}

Lombardi, M. ^{[3
]}

Nonino, M. ^{[8
]}

Sartoris, B. ^{[10
]}

Tozzi, P. ^{[11
]}

Bartelmann, M. ^{[12
]}

Bradley, L. ^{[13
]}

Caputi, K. I. ^{[14
]}

Coe, D. ^{[13
]}

Ford, H. ^{[15
]}

Fritz, A. ^{[16
]}

Gobat, R. ^{[17
]}

Postman, M. ^{[13
]}

Seitz, S. ^{[7
,18
]}

Zitrin, A. ^{[19
]}

机构：

[1] Univ Ferrara, Dipartimento Fis & Sci Terra, Via Saragat 1, I-44122 Ferrara, Italy

[2] INAF, Osservatorio Astron Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy

[3] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy

[4] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark

[5] Ist Nazl Fis Nucl, Sez Bologna, Viale Berti Pichat 6-2, I-40127 Bologna, Italy

[6] INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy

[7] Univ Observ Munich, Scheinerstr 1, D-81679 Munich, Germany

[8] INAF, Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy

[9] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan

[10] Univ Trieste, Dipartimento Fis, Via GB Tiepolo 11, I-34143 Trieste, Italy

[11] INAF, Osservatorio Astrofis Arcetri, I-50125 Florence, Italy

[12] Heidelberg Univ, Zentrum Astron, Inst Theoret Astrophys, Philosophenweg 12, D-69120 Heidelberg, Germany

[13] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21208 USA

[14] Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands

[15] Johns Hopkins Univ, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA

[16] INAF, Ist Astrofis Spaziale & Fis Cosm IASF, Via E Bassini 15, I-20133 Milan, Italy

[17] Korea Inst Adv Study, Sch Phys, Hoegiro 85, Seoul 02455, South Korea

[18] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[19] Ben Gurion Univ Negev, Phys Dept, POB 653, IL-84105 Beer Sheva, Israel

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 607卷

关键词：

galaxies: clusters: individual: MACS J1206.2-0847; gravitational lensing: strong; cosmology: observations; dark matter; COLD DARK-MATTER; GALAXY CLUSTERS; X-RAY; DENSITY PROFILES; CROSS-SECTION; HALOS; MUSE; UNIVERSAL; PROJECT; ARC;

D O I：

10.1051/0004-6361/201731498

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a new strong lensing analysis of the galaxy cluster MACS J1206.2-0847 (MACS 1206), at z = 0 : 44, using deep spectroscopy from CLASH-VLT and VLT/MUSE archival data in combination with imaging from the Cluster Lensing and Supernova survey with Hubble. MUSE observations enable the spectroscopic identification of 23 new multiply imaged sources, extending the previous compilations by a factor of approximately five. In total, we use the positional measurements of 82 spectroscopic multiple images belonging to 27 families at z = 1 : 0 6 : 1 to reconstruct the projected total mass distribution of MACS 1206. Remarkably, 11 multiple images are found within 50 kpc of the brightest cluster galaxy, making this an unprecedented set of constraints for the innermost projected mass distribution of a galaxy cluster. We thus find that, although dynamically relaxed, the smooth matter component (dark matter plus hot gas) of MACS 1206 shows a significant asymmetry, which closely follows the asymmetric distribution of the stellar component (galaxy members and intracluster light). We determine the value of the innermost logarithmic slope of the projected total mass density profile and find it to be close to the canonical Navarro-Frenk-White value. We demonstrate that this quantity is very robust against different parametrizations of the diffuse mass component; however, this is not the case when only one central image is used in the mass reconstruction. We also show that the mass density profile from our new strong lensing model is in very good agreement with dynamical and X-ray measurements at larger radii, where they overlap.

引用

页数：21

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