Morphological decomposition of TNG50 galaxies: methodology and catalogue
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 stel...
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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2022 June 21
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2022, Volume: 515, Issue: 1, Pages: 1524-1543 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stac1708 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stac1708
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| Author Notes: | Tommaso Zana, Alessandro Lupi, Matteo Bonetti, Massimo Dotti, Yetli Rosas-Guevara, David Izquierdo-Villalba, Silvia Bonoli, Lars Hernquist and Dylan Nelson |
| Summary: | 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, $10^{9} \lesssim M_{*}/~\rm M_{\odot }\le 5 \times 10^{9}$) undergo a major growth in their disc components after z ∼ 1, whereas (iii) the most massive galaxies |
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| Item Description: | Gesehen am 06.09.2022 |
| Physical Description: | Online Resource |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stac1708 |