Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. I. Sample Selection, Data Reduction and NGC 7078 Results
A. Bellini (1), J. Anderson (1), R. P. van der Marel (1), L. L., Watkins (1), I. R. King (2), P. Bianchini (3), J. Chanam\'e (4), R. Chandar, (5), A. M. Cool (6), F. R. Ferraro (7), H. Ford (8), D. Massari (7) ((1), STScI, (2) Univ. Washington, (3) MPIA, (4) PUC

TL;DR
This paper introduces high-precision proper motion catalogs for 22 globular clusters using HST data, enabling detailed internal kinematic studies and advancing understanding of cluster dynamics.
Contribution
It presents a new reduction pipeline for deriving homogeneous proper motions from heterogeneous archival HST data and provides the first PM catalog for NGC 7078.
Findings
Over 1.3 million stars with proper motions measured
Validation of the catalog through comparison with existing data
Analysis of velocity dispersion dependence on radius and stellar properties
Abstract
We present the first study of high-precision internal proper motions (PMs) in a large sample of globular clusters, based on Hubble Space Telescope (HST) data obtained over the past decade with the ACS/WFC, ACS/HRC, and WFC3/UVIS instruments. We determine PMs for over 1.3 million stars in the central regions of 22 clusters, with a median number of ~60,000 stars per cluster. These PMs have the potential to significantly advance our understanding of the internal kinematics of globular clusters by extending past line-of-sight (LOS) velocity measurements to two- or three-dimensional velocities, lower stellar masses, and larger sample sizes. We describe the reduction pipeline that we developed to derive homogeneous PMs from the very heterogeneous archival data. We demonstrate the quality of the measurements through extensive Monte-Carlo simulations. We also discuss the PM errors introduced by…
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