| Full text | |
| Author(s): |
Perez-Villegas, A.
[1]
;
Rossi, L.
[2]
;
Ortolani, S.
[3, 4]
;
Casotto, S.
[3, 4]
;
Barbuy, B.
[1]
;
Bica, E.
[5]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, IAG, Rua Matao 1226, BR-05508900 Sao Paulo - Brazil
[2] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122 - Australia
[3] Univ Padua, Dipartimento Fis & Astron, I-35122 Padua - Italy
[4] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua - Italy
[5] Univ Fed Rio Grande do Sul, Dept Astron, CP 15051, BR-91501970 Porto Alegre, RS - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA; v. 35, MAY 30 2018. |
| Web of Science Citations: | 10 |
| Abstract | |
We present orbit analysis for a sample of eight inner bulge globular clusters, together with one reference halo object. We used proper motion values derived from long time base CCD data. Orbits are integrated in both an axisymmetric model and a model including the Galactic bar potential. The inclusion of the bar proved to be essential for the description of the dynamical behaviour of the clusters. We use the Monte Carlo scheme to construct the initial conditions for each cluster, taking into account the uncertainties in the kinematical data and distances. The sample clusters show typically maximum height to the Galactic plane below 1.5 kpc, and develop rather eccentric orbits. Seven of the bulge sample clusters share the orbital properties of the bar/bulge, having perigalactic and apogalatic distances, and maximum vertical excursion from the Galactic plane inside the bar region. NGC 6540 instead shows a completely different orbital behaviour, having a dynamical signature of the thick disc. Both prograde and prograde-retrograde orbits with respect to the direction of the Galactic rotation were revealed, which might characterise a chaotic behaviour. (AU) | |
| FAPESP's process: | 17/15893-1 - Globular cluster orbits of bulge: the formation and evolution of the Milky Way |
| Grantee: | Maria de Los Angeles Perez Villegas |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |