SIMBAD references

2020MNRAS.491.3251P - Mon. Not. R. Astron. Soc., 491, 3251-3265 (2020/January-3)

Globular clusters in the inner Galaxy classified from dynamical orbital criteria.


Abstract (from CDS):

Globular clusters (GCs) are the most ancient stellar systems in the Milky Way. Therefore, they play a key role in the understanding of the early chemical and dynamical evolution of our Galaxy. Around 40 per cent of them are placed within ∼4 kpc from the Galactic centre. In that region, all Galactic components overlap, making their disentanglement a challenging task. With GaiaData Release 2, we have accurate absolute proper motions for the entire sample of known GCs that have been associated with the bulge/bar region. Combining them with distances, from RR Lyrae when available, as well as radial velocities from spectroscopy, we can perform an orbital analysis of the sample, employing a steady Galactic potential with a bar. We applied a clustering algorithm to the orbital parameters apogalactic distance and the maximum vertical excursion from the plane, in order to identify the clusters that have high probability to belong to the bulge/bar, thick disc, inner halo, or outer halo component. We found that 30 per cent of the clusters classified as bulge GCs based on their location are just passing by the inner Galaxy, they appear to belong to the inner halo or thick disc component, instead. Most GCs that are confirmed to be bulge GCs are not following the bar structure and are older than the epoch of the bar formation.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Galaxy: bulge - globular clusters: general - Galaxy: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/MNRAS/491/3251): table1.dat table2.dat table4.dat table5.dat table6.dat table7.dat>

Simbad objects: 83

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2020MNRAS.491.3251P and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact