oMEGACat II -- Photometry and proper motions for 1.4 million stars in Omega Centauri and its rotation in the plane of the sky

Autor(en)

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

Abstrakt

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(en)

Institut für Astrophysik

Journal

The Astrophysical Journal

ISSN

0004-637X

Publikationsdatum

04-2024

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

Link zum Portal

https://ucris.univie.ac.at/portal/de/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