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Title:
Orbits of Selected Globular Clusters in the Galactic Bulge
Authors:
Pérez-Villegas, A.; Rossi, L.; Ortolani, S.; Casotto, S.; Barbuy, B.; Bica, E.
Affiliation:
AA(Universidade de São Paulo, IAG, Rua do Matão 1226, Cidade Universitária, São Paulo 05508-900, Brazil), AB(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia), AC(Dipartimento di Fisica e Astronomia, Università di Padova, I-35122 Padova, Italy; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy), AD(Dipartimento di Fisica e Astronomia, Università di Padova, I-35122 Padova, Italy; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy), AE(Universidade de São Paulo, IAG, Rua do Matão 1226, Cidade Universitária, São Paulo 05508-900, Brazil), AF(Universidade Federal do Rio Grande do Sul, Departamento de Astronomia, CP 15051, Porto Alegre 91501-970, Brazil)
Publication:
Publications of the Astronomical Society of Australia, Volume 35, id.e021 11 pp. (PASA Homepage)
Publication Date:
05/2018
Origin:
CUP
Astronomy Keywords:
Galaxy: bulge, Galaxy: globular clusters: individual: Terzan 1, Terzan 2, Terzan 4, Terzan 9, NGC 6522, NGC 6558, NGC 6540, Palomar 6, NGC 6652
Abstract Copyright:
2018: Astronomical Society of Australia
DOI:
10.1017/pasa.2018.16
Bibliographic Code:
2018PASA...35...21P

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.
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