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Drimmel, R.; Khanna, S.; D’Onghia, E.; Tepper-García, T.; Bland-Hawthorn, J.; Chemin, L.; Ripepi, V.; Romero-Gómez, M.; Ramos, P.; Poggio, E.; Andrae, R.; Blomme, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Clementini, G.; Figueras, F.; Fouesneau, M.; Frémat, Y.; Lobel, A.; Marshall, D.; Muraveva, T.
Astronomy & astrophysics, 02/2023, Letnik: 670Journal Article
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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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