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Title: | Kinematics of the SN Refsdal host revealed by MUSE: a regularly rotating spiral galaxy at z ≃ 1.5 | Authors: | Di Teodoro, E. M. Grillo, C. Fraternali, F. Gobat, R. Karman, W. MERCURIO, AMATA Rosati, P. Balestra, I. Caminha, G. B. Caputi, K. I. Lombardi, M. Suyu, S. H. Treu, T. VANZELLA, Eros |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 476 | Issue: | 1 | First Page: | 804 | Abstract: | 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 ≃ 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. | URI: | http://hdl.handle.net/20.500.12386/28441 | URL: | https://academic.oup.com/mnras/article-abstract/476/1/804/4828360 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty175 | Bibcode ADS: | 2018MNRAS.476..804D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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1801.06546.pdf | 1.2 MB | Adobe PDF | View/Open | |
sty175.pdf | PDF editoriale | 2.1 MB | Adobe PDF | View/Open |
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