Kinematics of the SN Refsdal host revealed by MUSE: a regularly rotating spiral galaxy at z ≃ 1.5

被引：17

作者：

Di Teodoro, E. M. ^{[1
]}

Grillo, C. ^{[2
,3
]}

Fraternali, F. ^{[4
,5
]}

Gobat, R. ^{[6
]}

Karman, W. ^{[5
]}

Mercurio, A. ^{[7
]}

Rosati, P. ^{[8
]}

Balestra, I. ^{[9
]}

Caminha, G. B. ^{[8
]}

Caputi, K. I. ^{[5
]}

Lombardi, M. ^{[2
]}

Suyu, S. H. ^{[10
,11
,12
]}

Treu, T. ^{[13
]}

Vanzella, E. ^{[14
]}

机构：

[1] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

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

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

[4] Univ Bologna, Dipartimento Fis & Astron, 6-2 Viale Berti Pichat, I-40127 Bologna, Italy

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

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

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

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

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

[10] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

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

[12] Tech Univ Munich, Phys Dept, James Franck Str 1, D-85748 Garching, Germany

[13] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[14] INAF Osservatorio Astron Bologna, Via Ranzani 1, I-40127 Bologna, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 476卷 / 01期

基金：

澳大利亚研究理事会;

关键词：

gravitational lensing: strong; galaxies: clusters: individual: MACS J1149.5+2223298; galaxies: high-redshift; galaxies: kinematics and dynamics; GRAVITATIONALLY LENSED GALAXIES; STAR-FORMING GALAXIES; RESOLVED SPECTROSCOPY; MULTIPLE IMAGES; COMPLETE SAMPLE; DISK GALAXIES; MASS; CURVES; EVOLUTION; DISCOVERY;

D O I：

10.1093/mnras/sty175

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use Multi Unit Spectroscopic Explorer (MUSE) observations of the galaxy cluster MACS J1149.5+2223 to explore the kinematics of the grand-design spiral galaxy (Sp1149) hosting the supernova 'Refsdal'. Sp1149 lies at z similar or equal to 1.49, has a stellar mass M-* similar or equal to 5 x 10(9) M-circle dot, has a star formation rate (SFR) similar or equal to 1-6 M-circle dot yr(-1), and represents a likely progenitor of a Milky Way-like galaxy. All the four multiple images of Sp1149 in our data show strong [O II]-line emissions pointing to a clear rotation pattern. We take advantage of the gravitational lensing magnification effect (similar or equal to 4x) on the [OII] emission of the least distorted image to fit three-dimensional kinematic models to the MUSE data cube and derive the rotation curve and the velocity dispersion profile of Sp1149. We find that the rotation curve steeply rises, peaks at R similar or equal to 1 kpc, and then (initially) declines and flattens to an average V-flat = 128(-19)(+29) km s(-1). The shape of the rotation curve is well determined, but the actual value of V-flat is quite uncertain because of the nearly face-on configuration of the galaxy. The intrinsic velocity dispersion due to gas turbulence is almost constant across the entire disc with an average of 27 +/- 5 kms(-1). This value is consistent with z = 0 measurements in the ionized gas component and a factor of 2-4 lower than other estimates in different galaxies at similar redshifts. The average stellar-to-total mass fraction is of the order of one-fifth. Our kinematic analysis returns the picture of a regular star-forming, mildly turbulent, rotation-dominated (V/sigma similar or equal to 5) spiral galaxy in a 4-Gyr-old Universe.

引用

页码：804 / 813

页数：10

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