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Galactic Globular Clusters: A new catalog of masses, structural parameters, velocity dispersion profiles, proper motions and space orbits

Published online by Cambridge University Press:  11 March 2020

Michael Hilker Open the ORCID record for Michael Hilker [Opens in a new window] ,
Holger Baumgardt ,
Antonio Sollima Open the ORCID record for Antonio Sollima [Opens in a new window]  and
Andrea Bellini
Michael Hilker
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748Garching, Germany email: mhilker@eso.org
Holger Baumgardt
Affiliation:
School of Mathematics and Physics, The University of Queensland, St. Lucia, QLD 4072, Australia email: h.baumgardt@uq.edu.au
Antonio Sollima
Affiliation:
INAF Osservatorio Astronomico di Bologna, via Gobetti 93/3, I-Bologna 40129, Italy email: antonio.sollima@inaf.it
Andrea Bellini
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: bellini@stsci.edu
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Abstract

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We collected radial velocities of more than 50.000 individual stars in 156 Galactic globular clusters (GGC) and matched them with HST photometry and Gaia DR2 proper motions. This allowed us to derive the GGC’s mean proper motions and space velocities. By fitting a large set of N-body simulations to their velocity dispersion and surface density profiles, combined with new measurements of their internal radially dependent mass functions, we have determined their present-day masses and structural parameters, and for 144 GGCs their internal kinematics. We also derive the initial cluster masses by calculating the cluster orbits backwards in time applying suitable recipes to account for mass-loss and dynamical friction. The new fundamental parameters of GGCs are publicly available via an online database, which will regularly be updated.

Keywords

Galaxy: globular clusters: generalstars: kinematicsstars: luminosity functionmass functioncatalogsmethods: n-body simulations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 451 - 454
Copyright
© International Astronomical Union 2020

References

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