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Gaia and Hubble unveil the kinematics of stellar populations in the Type II globular clusters {\omega} Centauri and M 22 by Cordoni, G.; Milone, A. P.; Marino, A. F.; Da Costa, G. S.; Dondoglio, E.; Jerjen, H.; Lagioia, E. P.; Mastrobuono-Battisti, A.; Norris, J. E.; Tailo, M.; Yong, D. is a scholarly article available to read on EtoBox.

What is Gaia and Hubble unveil the kinematics of stellar populations in the Type II globular clusters {\omega} Centauri and M 22 about?

The origin of multiple stellar populations in Globular Clusters (GCs) is one of the greatest mysteries of modern stellar astrophysics. N-body simulations suggest that the present-day dynamics of GC stars can constrain the events that occurred at high redshift and led to the formation of multiple populations. Here, we combine multi-band photometry from the Hubble Space Telescope (HST) and ground-based facilities with HST and Gaia Data Release 2 proper motions to investigate the spatial distributions and the motions in the plane of the sky of multiple populations in the type II GCs NGC 5139 ($\omega\,$Centauri) and NGC 6656 (M 22). We first analyzed stellar populations with different metallicities. Fe-poor and Fe-rich stars in M 22 share similar spatial distributions and rotation patterns and exhibit similar isotropic motions. Similarly, the two main populations with different iron abundance in $\omega\,$Centauri share similar ellipticities and rotation patterns. When analyzing different radial regions, we find that the rotation amplitude decreases from the center towards the external regions. Fe-poor and Fe-rich stars of $\omega\,$Centauri are radially anisotropic in the central reg

Author

Cordoni, G.; Milone, A. P.; Marino, A. F.; Da Costa, G. S.; Dondoglio, E.; Jerjen, H.; Lagioia, E. P.; Mastrobuono-Battisti, A.; Norris, J. E.; Tailo, M.; Yong, D.

Published

2020

Language

EN