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Globular Cluster Streams as Galactic High-Precision Scales

Published online by Cambridge University Press:  09 May 2016

Andreas H.W. Küpper ,
Eduardo Balbinot ,
Ana Bonaca ,
Kathryn V. Johnston ,
David W. Hogg ,
Pavel Kroupa  and
Basilio X. Santiago
Andreas H.W. Küpper
Affiliation:
Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA email: [email protected]
Eduardo Balbinot
Affiliation:
Department of Physics, University of Surrey, Guildford GU2 7XH, UK
Ana Bonaca
Affiliation:
Department of Astronomy, Yale University, New Haven, CT 06511, USA
Kathryn V. Johnston
Affiliation:
Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA email: [email protected]
David W. Hogg
Affiliation:
Center for Cosmology and Particle Physics, Department of Physics, New York University, 4 Washington Place, New York, NY 10003, USA
Pavel Kroupa
Affiliation:
Helmholtz-Institut für Strahlen- und Kernphysik (HISKP), University of Bonn, Nussallee 14-16, 53115 Bonn, Germany
Basilio X. Santiago
Affiliation:
Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Porto Alegre 91501-970, RS, Brasil Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brasil
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Abstract

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Tidal streams of globular clusters are ideal tracers of the Galactic gravitational potential. Compared to the few known, complex and diffuse dwarf-galaxy streams, they are kinematically cold, have thin morphologies and are abundant in the halo of the Milky Way. Their coldness and thinness in combination with potential epicyclic substructure in the vicinity of the stream progenitor turns them into high-precision scales. With the example of Palomar 5, we demonstrate how modeling of a globular cluster stream allows us to simultaneously measure the properties of the disrupting globular cluster, its orbital motion, and the gravitational potential of the Milky Way.

Keywords

methods: numericalGalaxy: haloGalaxy: structureglobular clusters: individual (Palomar 5)dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 140 - 144
Copyright
Copyright © International Astronomical Union 2016 

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