id:"swepub:oai:lup.lub.lu.se:05bf799a-557b-4b64-ba33-28a78a24579f"
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- Palicio, P. A.University of Côte d'Azur (författare)
Spiral-like features in the disc revealed by Gaia DR3 radial actions
- Artikel/kapitelEngelska2023
Förlag, utgivningsår, omfång ...
- 2023-01-30
- EDP Sciences,2023
Nummerbeteckningar
- LIBRIS-ID:oai:lup.lub.lu.se:05bf799a-557b-4b64-ba33-28a78a24579f
- https://lup.lub.lu.se/record/05bf799a-557b-4b64-ba33-28a78a24579fURI
- https://doi.org/10.1051/0004-6361/202245026DOI
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- Språk:engelska
- Sammanfattning på:engelska
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- Context. The so-called action variables are specific functions of the positions and velocities that remain constant along the stellar orbit. The astrometry provided by Gaia Early Data Release 3 (EDR3), combined with the velocities inferred from the Radial Velocity Spectrograph (RVS) spectra of Gaia DR3, allows for the estimation of these actions for the largest volume of stars to date. Aims. We explore such actions with the aim of locating structures in the Galactic disc. Methods. We computed the actions and the orbital parameters of the Gaia DR3 stars, assuming an axisymmetric model for the Milky Way. Using Gaia DR3 photometric data, we also selected a subset of giant stars with better astrometry as a control sample. Results. We find that the maps of the percentiles of the radial action JR reveal arc-like segments. We found a high JR region centered at Raa a10.5 kpc of 1 kpc width, as well as three arc-shape regions dominated by circular orbits at inner radii. We also identified the spiral arms in the overdensities of the giant population. Conclusions. For Galactic coordinates (X, Y, Z), we find good agreement with the literature in the innermost region for the Scutum-Sagittarius spiral arms. At larger radii, the low JR structure tracks the Local arm at negative X, while for the Perseus arm, the agreement is restricted to the Xa < a2 kpc region, with a displacement with respect to the literature at more negative longitudes. We detected a high JR area at a Galactocentric radii of a1410.5 kpc, consistent with some estimations of the Outer Lindblad Resonance location. We conclude that the pattern in the dynamics of the old stars is consistent in several places with the spatial distribution of the spiral arms traced by young populations, with small potential contributions from the moving groups.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- Galaxy: disk
- Galaxy: kinematics and dynamics
- Galaxy: structure
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Recio-Blanco, A.University of Côte d'Azur (författare)
- Poggio, E.INAF-Osservatorio Astronomico di Roma,University of Côte d'Azur (författare)
- Antoja, T.CSIC Institut de Ciènces de l’Espai (IEEC),University of Barcelona (författare)
- McMillan, P. J.Lund University,Lunds universitet,Astronomi - Har omorganiserats,Institutionen för astronomi och teoretisk fysik - Har omorganiserats,Naturvetenskapliga fakulteten,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Lund Observatory - Has been reorganised,Department of Astronomy and Theoretical Physics - Has been reorganised,Faculty of Science,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)astr-pmi (författare)
- Spitoni, E.University of Côte d'Azur (författare)
- University of Côte d'AzurINAF-Osservatorio Astronomico di Roma (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Astronomy and Astrophysics: EDP Sciences6700004-63611432-0746
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- Palicio, P. A.
- Recio-Blanco, A.
- Poggio, E.
- Antoja, T.
- McMillan, P. J.
- Spitoni, E.
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