Radial phase spirals in the Solar neighbourhood
Fuente:
arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | |
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| _version_ | 1866917569359773696 |
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| author | Hunt, Jason A. S. Price-Whelan, Adrian M. Johnston, Kathryn V. McClure, Rachel L. Filion, Carrie Cassese, Ben Horta, Danny |
| author_facet | Hunt, Jason A. S. Price-Whelan, Adrian M. Johnston, Kathryn V. McClure, Rachel L. Filion, Carrie Cassese, Ben Horta, Danny |
| contents | The second data release of ESA's $Gaia$ mission revealed numerous signatures of disequilibrium in the Milky Way's disc. These signatures are seen in the planar kinematics of stars, which manifest as ridges and ripples in $R-v_ϕ$, and in vertical kinematics, where a prominent spiral is seen in the $z-v_z$ phase space. In this work, we show an equivalent $ΔR-v_{\mathrm{R}}$ phase spiral forms following a perturbation to the disc. We demonstrate the behaviour of the $ΔR-v_{\mathrm{R}}$ phase spirals in both a toy model and a high resolution $N$-body simulation of a satellite interaction. We then confront these models with the data, where we find partial $ΔR-v_{\mathrm{R}}$ phase spirals in the Solar neighborhood using the most recent data from $Gaia$ DR3. This structure indicates ongoing radial phase mixing in the Galactic disc, suggesting a history of recent perturbations, either through internal or external (e.g., satellite) processes. Future work modelling the $z-v_z$ and $ΔR-v_{\mathrm{R}}$ phase spirals in tandem may help break degeneracy's between possible origins of the perturbation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_08748 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Radial phase spirals in the Solar neighbourhood Hunt, Jason A. S. Price-Whelan, Adrian M. Johnston, Kathryn V. McClure, Rachel L. Filion, Carrie Cassese, Ben Horta, Danny Astrophysics of Galaxies The second data release of ESA's $Gaia$ mission revealed numerous signatures of disequilibrium in the Milky Way's disc. These signatures are seen in the planar kinematics of stars, which manifest as ridges and ripples in $R-v_ϕ$, and in vertical kinematics, where a prominent spiral is seen in the $z-v_z$ phase space. In this work, we show an equivalent $ΔR-v_{\mathrm{R}}$ phase spiral forms following a perturbation to the disc. We demonstrate the behaviour of the $ΔR-v_{\mathrm{R}}$ phase spirals in both a toy model and a high resolution $N$-body simulation of a satellite interaction. We then confront these models with the data, where we find partial $ΔR-v_{\mathrm{R}}$ phase spirals in the Solar neighborhood using the most recent data from $Gaia$ DR3. This structure indicates ongoing radial phase mixing in the Galactic disc, suggesting a history of recent perturbations, either through internal or external (e.g., satellite) processes. Future work modelling the $z-v_z$ and $ΔR-v_{\mathrm{R}}$ phase spirals in tandem may help break degeneracy's between possible origins of the perturbation. |
| title | Radial phase spirals in the Solar neighbourhood |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.08748 |