A new resonance-like feature in the outer disc of the Milky Way

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 o...

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Published in:Astronomy and astrophysics (Berlin) 2023-02, Vol.670, p.A10
Main Authors: 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.
Format: Article
Language:English
Subjects:
Angular momentum
Cepheid variables
Configurations
Red giant stars
Resonance
Sciences of the Universe
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Summary: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.
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/202244605