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  Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2

Khoperskov, S., Gerhard, O., Matteo, P. D., Haywood, M., Katz, D., Khrapov, S., et al. (2020). Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2. Astronomy and Astrophysics, 634: L8. doi:10.1051/0004-6361/201936645.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-2FC0-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-3035-8
Genre: Journal Article

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Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2.pdf (Any fulltext), 20MB
 
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Khoperskov, S.1, Author              
Gerhard, O.1, Author              
Matteo, P. Di, Author
Haywood, M., Author
Katz, D., Author
Khrapov, S., Author
Khoperskov, A., Author
Arnaboldi, M., Author
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: In this paper we introduce a new method for analysing Milky Way phase-space which allows us to reveal the imprint left by the Milky Way bar and spiral arms on the stars with full phase-space data in Gaia Data Release 2. The unprecedented quality and extended spatial coverage of these data allowed us to discover six prominent stellar density structures in the disc to a distance of 5 kpc from the Sun. Four of these structures correspond to the spiral arms detected previously in the gas and young stars (Scutum-Centaurus, Sagittarius, Local, and Perseus). The remaining two are associated with the main resonances of the Milky Way bar where corotation is placed at around 6.2 kpc and the outer Lindblad resonance beyond the solar radius, at around 9 kpc. For the first time we provide evidence of the imprint left by spiral arms and resonances in the stellar densities not relying on a specific tracer, through enhancing the signatures left by these asymmetries. Our method offers new avenues for studying how the stellar populations in our Galaxy are shaped.

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 Dates: 2020-02-04
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201936645
Other: LOCALID: 3220443
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 634 Sequence Number: L8 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1