We present mordor (MORphological DecOmposeR), a new algorithm for structural decomposition of simulated galaxies based on stellar kinematics. The code measures the properties of up to five structural components (a thin/cold and a thick/warm disc, a classical and a secular bulge, and a spherical stellar halo), and determines the properties of a stellar bar (if present). A comparison with other algorithms presented in the literature yields overall good agreement, with mordor displaying a higher flexibility in correctly decomposing systems and identifying bars in crowded environments (e.g. with ongoing fly-bys, often observable in cosmological simulations). We use mordor to analyse galaxies in the TNG50 simulation and find the following: (i) the thick disc component undergoes the strongest evolution in the binding energy-circularity plane, as expected when disc galaxies decrease their turbulent-rotational support with cosmic time; (ii) smaller galaxies (with stellar mass, 109≲ M∗/M⊙≤ 5 × 109) undergo a major growth in their disc components after z ∼1, whereas (iii) the most massive galaxies (5 × 1010< M∗/M⊙≤ 5× 1011) evolve towards more spheroidal dominated objects down to z = 0 due to frequent gravitational interactions with satellites; (iv) the fraction of barred galaxies grows rapidly at high redshift and stabilizes below z ∼2, except for the most massive galaxies that show a decrease in the bar occupation fraction at low redshift; (v) galaxies with M∗∼ 1011M⊙ exhibit the highest relative occurrence of bars at z = 0, in agreement with observational studies. We publicly release mordor and the morphological catalogue of TNG50 galaxies.

Zana, T., Lupi, A., Bonetti, M., Dotti, M., Rosas-Guevara, Y., Izquierdo-Villalba, D., et al. (2022). Morphological decomposition of TNG50 galaxies: methodology and catalogue. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 515(1), 1524-1543 [10.1093/mnras/stac1708].

Morphological decomposition of TNG50 galaxies: methodology and catalogue

Bonetti M.;Dotti M.;Izquierdo-Villalba D.;
2022

Abstract

We present mordor (MORphological DecOmposeR), a new algorithm for structural decomposition of simulated galaxies based on stellar kinematics. The code measures the properties of up to five structural components (a thin/cold and a thick/warm disc, a classical and a secular bulge, and a spherical stellar halo), and determines the properties of a stellar bar (if present). A comparison with other algorithms presented in the literature yields overall good agreement, with mordor displaying a higher flexibility in correctly decomposing systems and identifying bars in crowded environments (e.g. with ongoing fly-bys, often observable in cosmological simulations). We use mordor to analyse galaxies in the TNG50 simulation and find the following: (i) the thick disc component undergoes the strongest evolution in the binding energy-circularity plane, as expected when disc galaxies decrease their turbulent-rotational support with cosmic time; (ii) smaller galaxies (with stellar mass, 109≲ M∗/M⊙≤ 5 × 109) undergo a major growth in their disc components after z ∼1, whereas (iii) the most massive galaxies (5 × 1010< M∗/M⊙≤ 5× 1011) evolve towards more spheroidal dominated objects down to z = 0 due to frequent gravitational interactions with satellites; (iv) the fraction of barred galaxies grows rapidly at high redshift and stabilizes below z ∼2, except for the most massive galaxies that show a decrease in the bar occupation fraction at low redshift; (v) galaxies with M∗∼ 1011M⊙ exhibit the highest relative occurrence of bars at z = 0, in agreement with observational studies. We publicly release mordor and the morphological catalogue of TNG50 galaxies.
Articolo in rivista - Articolo scientifico
galaxies: structure; gravitation; methods: numerical; stars: kinematics and dynamics;
English
21-giu-2022
2022
515
1
1524
1543
reserved
Zana, T., Lupi, A., Bonetti, M., Dotti, M., Rosas-Guevara, Y., Izquierdo-Villalba, D., et al. (2022). Morphological decomposition of TNG50 galaxies: methodology and catalogue. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 515(1), 1524-1543 [10.1093/mnras/stac1708].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/466775
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