Séminaire/Seminar Galaxies |
| « Gaia Early Data Release 3 (EDR3) view on Galactic globular clusters and satellites » |
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Eugene Vasiliev |
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We explore the population of Milky Way globular clusters, using Gaia EDR3
astrometry to determine the mean parallaxes and proper motions (PM), as well as PM dispersion and rotation profiles. We compare the parallaxes with distances from literature and find a good agreement, with some indications that the parallaxes corrected according to the Lindegren et al.(2021) recipe are slightly (<0.01 mas) overestimated. By examining the dispersion of parallaxes and PM at different distances from cluster centres, we find that the formal uncertainties are underestimated by 10-20% in high-density regions. After correcting for these deficiencies, we conclude that our PM dispersion profiles are in good agreement with line-of-sight velocity dispersion profiles, and use them to derive kinematic distances to these clusters. |
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jeudi 17 juin 2021 - 11:30 Webinaire Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |