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http://hdl.handle.net/20.500.12386/34453
Title: | The Fundamental Plane of cluster spheroidal galaxies at z ∼ 1.3: evidence for mass-dependent evolution | Authors: | SARACCO, Paolo GARGIULO, ADRIANA LA BARBERA, Francesco Annunziatella, M. Marchesini, D. |
Issue Date: | 2020 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 491 | Issue: | 2 | First Page: | 1777 | Abstract: | We present spectroscopic observations obtained at the Large Binocular Telescope in the field of the cluster XLSSJ0223-0436 at z = 1.22. We confirm 12 spheroids cluster members and determine stellar velocity dispersion for 7 of them. We combine these data with those in the literature for clusters RXJ0848+4453 at z = 1.27 (8 galaxies) and XMMJ2235-2557 at z = 1.39 (7 galaxies) to determine the Fundamental Plane (FP) of cluster spheroids. We find that the FP at z ∼ 1.3 is offset and rotated (∼3σ) with respect to the local FP. The offset corresponds to a mean evolution Δlog(Mdyn/L) = (-0.5 ± 0.1)z. High-redshift galaxies follow a steeper mass-dependent Mdyn/L-Mdyn relation than local ones. Assuming Δ log(Mdyn/L) = Δ log(M*/L), higher mass galaxies [log(Mdyn/M⊙) ≥ 11.5] have a higher formation redshift (zf ≥ 6.5) than lower mass ones [z ≤2 for log(Mdyn/M⊙≤ 10)], with a median zf ≃ 2.5 for the whole sample. Also, galaxies with higher stellar mass density host stellar populations formed earlier than those in lower density galaxies. At fixed initial mass function, Mdyn/M* varies systematically with mass and mass density. It follows that the evolution of the stellar populations (M*/L) accounts for the observed evolution of Mdyn/L for Mdyn> 10^11 M⊙ galaxies, while accounts for ∼85 per cent of the evolution at M<SUB>dyn</SUB> < 10^11</SUP> M⊙. We find no evidence in favour of structural evolution of individual galaxies, while we find evidences that spheroids later added to the population may account for the observed discrepancy between Δlog(Mdyn/L) and Δ log(M*/L) at masses <10^11<M⊙. Thus, the evolution of the FP of cluster spheroids is consistent with the mass-dependent and mass density-dependent evolution of their stellar populations superimposed to a minor contribution of spheroids joining the population at later times. | URI: | http://hdl.handle.net/20.500.12386/34453 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz3109 | Bibcode ADS: | 2020MNRAS.491.1777S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stz3109.pdf | PDF editoriale | 1.92 MB | Adobe PDF | View/Open |
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