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Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 634, pp.L8. ⟨10.1051/0004-6361/201936645⟩
- Publication Year :
- 2020
- Publisher :
- EDP Sciences, 2020.
-
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 enable 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.<br />10 pages, 6 figures, accepted for publication in A&A Letters
- Subjects :
- Milky Way
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
Galaxy: disk
0103 physical sciences
Galaxy formation and evolution
Astrophysics::Solar and Stellar Astrophysics
Disc
Galaxy: structure
010303 astronomy & astrophysics
Stellar density
Astrophysics::Galaxy Astrophysics
Galaxy: evolution
Physics
Spiral galaxy
010308 nuclear & particles physics
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
[SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]
Stars
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
[SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA]
Astrophysics::Earth and Planetary Astrophysics
Galaxy: kinematics and dynamics
Lindblad resonance
Subjects
Details
- ISSN :
- 14320746 and 00046361
- Volume :
- 634
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....5592a8168c7296ac197e68eddda35ded