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Título: | A new resonance-like feature in the outer disc of the Milky Way |
Autor: | Drimmel, Ronald; Khanna, S.; D'Onghia, Elena; Tepper-García, T.; Bland-Hawthorn, J.; Chemin, Laurent; Ripepi, V.; Romero-Gómez, Mercè; Ramos, Pau; Poggio, Eloisa; Andrae, René; Blomme, R.; Cantat-Gaudin, Tristan; Castro-Ginard, Alfred; Clementini, Gisella; Figueras, Francesc; Fouesneau, Morgan; Frémat, Y.; Lobel, A.; Marshall, Douglas J.; Muraveva, T. | Palabras clave: | Galaxy: kinematics and dynamics Galaxy: structure Galaxy: disk Stars: variables: Cepheids |
Fecha de publicación: | 2023 | Editor: | EDP Sciences | Citación: | Astronomy and Astrophysics 670: A10 (2023) | Resumen: | Modern astrometric and spectroscopic surveys have revealed a wealth of structure in the phase space of stars in the Milky Way, with evidence of resonance features and non-equilibrium processes. Using the third Gaia data release, we present evidence of a new resonance-like feature in the outer disc of the Milky Way. The feature is most evident in the angular momentum distribution of the young classical Cepheids, a population for which we can derive accurate distances over much of the Galactic disc. We then searched for similar features in the outer disc using a much larger sample of red giant stars, as well as a compiled list of over 31 million stars with spectroscopic line-of-sight velocity measurements. While much less evident in these two older samples, the distribution of stars in action-configuration space suggests that resonance features are present here as well. The position of the feature in action-configuration space suggests that the new feature may be related to the Galactic bar, but other possibilities are discussed. | Versión del editor: | https://doi.org/10.1051/0004-6361/202244605 | URI: | http://hdl.handle.net/10261/339662 | DOI: | 10.1051/0004-6361/202244605 | E-ISSN: | 1432-0746 |
Aparece en las colecciones: | (ICE) Artículos |
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anewmilkyway.pdf | 1,92 MB | Adobe PDF | Visualizar/Abrir |
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