oMEGACat II -- Photometry and proper motions for 1.4 million stars in Omega Centauri and its rotation in the plane of the sky
- Author(s)
- Maximilian Häberle, Nadine Neumayer, Andrea Bellini, Mattia Libralato, Callie Clontz, Anil C. Seth, Maria Selina Nitschai, Sebastian Kamann, Mayte Alfaro-Cuello, Jay Anderson, Stefan Dreizler, Anja Feldmeier-Krause, Nikolay Kacharov, Marilyn Latour, Antonino Milone, Renuka Pechetti, Glenn van de Ven, Karina Voggel
- Abstract
Omega Centauri ($\omega$ Cen) is the most massive globular cluster of the Milky Way. It is thought to be the nucleus of an accreted dwarf galaxy because of its high mass and its complex stellar populations. To decipher its formation history and study its dynamics, we created the most comprehensive kinematic catalog for its inner region, by analyzing both archival and new Hubble Space Telescope (HST) data. Our catalog contains 1 395 781 proper-motion measurements out to the half-light radius of the cluster ($\sim$5.0') and down to $m_{F625W}\approx$25. The typical baseline for our proper-motion measurements is 20 years, leading to a median 1D proper motion precision of $\sim$11 $\mu$as yr$^{-1}$ for stars with $m_{F625W}\approx$18 mag, with even better precision ($\sim$6.6 $\mu$as yr$^{-1}$) achieved in the extensively observed centermost (r$
- Organisation(s)
- Department of Astrophysics
- Journal
- The Astrophysical Journal
- ISSN
- 0004-637X
- Publication date
- 04-2024
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/omegacat-ii--photometry-and-proper-motions-for-14-million-stars-in-omega-centauri-and-its-rotation-in-the-plane-of-the-sky(47997c7f-2d4a-481f-a78d-53dd0e326e2f).html