Relics of the Formation of the Galactic Halo from Gaia and APOGEE
Date Issued
2019
Author(s)
Abstract
The solar neighborhood potentially contains a very large number of kinematic groups which are related to the various building blocks of the stellar halo. We explore the vicinity of the Milky Way through the use of high quality astrometric and spectroscopic data from the most recent releases by Gaia and APOGEE. We chemically select 663 halo stars and analyse their kinematics and orbital properties in order to investigate and characterise the possibly detectable signatures that remain in phase-space. We find evidence of statistically significant substructures among 177 stars, with velocity difference less than 20 km/s, that are classified in 15-25 kinematic groups and compared to the high velocity streamers by Re Fiorentin et al. 2015. The signal is even stronger among the stars with [Mg/Fe] < 0.2 dex, that more likely have been accreted; preliminary results are shown. The chemical properties of the kinematically selected moving groups are going to be analysed to reconstruct the accretion history of the stellar halo.
Coverage
Conference proceedings for the 53rd ESLAB symposium "the Gaia universe"
Start page
54
Conferenece
53rd ESLAB symposium: the Gaia universe
Conferenece place
Noordwijk, The Netherlands
Conferenece date
8-12 April, 2019
Ads BibCode
2019gaia.confE..54R
Rights
open.access
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ReFiorentin_ProcESLAB.pdf
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Format
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