Di Teodoro, E. M.E. M.Di TeodoroGrillo, C.C.GrilloFraternali, F.F.FraternaliGobat, R.R.GobatKarman, W.W.KarmanMERCURIO, AMATAAMATAMERCURIORosati, P.P.RosatiBalestra, I.I.BalestraCaminha, G. B.G. B.CaminhaCaputi, K. I.K. I.CaputiLombardi, M.M.LombardiSuyu, S. H.S. H.SuyuTreu, T.T.TreuVANZELLA, ErosErosVANZELLA2020-11-192020-11-1920180035-8711http://hdl.handle.net/20.500.12386/28441We 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 ≃ 1.49, has a stellar mass M<SUB>*</SUB> ≃ 5 × 10<SUP>9</SUP> M<SUB>☉</SUB>, has a star formation rate (SFR) ∼eq 1-6 M_{☉} 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 (≃4×) on the [O II} 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 ≃ 1 kpc, and then (initially) declines and flattens to an average {V_flat}= 128^{+29}_{-19} km s<SUP>-1</SUP>. The shape of the rotation curve is well determined, but the actual value of V<SUB>flat</SUB> 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 km s<SUP>-1</SUP>. 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/σ ≃ 5) spiral galaxy in a 4-Gyr-old Universe.STAMPAenArticle10.1093/mnras/sty1752-s2.0-85043507532000429276700064https://academic.oup.com/mnras/article-abstract/476/1/804/48283602018MNRAS.476..804DFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems