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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 710188.0, MPI für Astronomie / Publikationen_mpia
Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of galactic globular clusters. I. Sample selection, data reduction, and NGC 7078 results
Authors:Bellini, A.; Anderson, J.; van der Marel, R. P.; Watkins, L. L.; King, I. R.; Bianchini, P.; Chanamé, J.; Chandar, R.; Cool, A. M.; Ferraro, F. R.; Ford, H.; Massari, D.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 115 (33 pp)
Audience:Not Specified
Abstract / Description: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 various systematic effects and the techniques that we have developed to correct or remove them to the extent possible. We provide in electronic form the catalog for NGC 7078 (M 15), which consists of 77,837 stars in the central 2.'4. We validate the catalog by comparison with existing PM measurements and LOS velocities and use it to study the dependence of the velocity dispersion on radius, stellar magnitude (or mass) along the main sequence, and direction in the plane of the sky (radial or tangential). Subsequent papers in this series will explore a range of applications in globular-cluster science and will also present the PM catalogs for the other sample clusters. Based on proprietary and archival observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.
Free Keywords:globular clusters: individual: NGC 104 (47 Tuc NGC 288 NGC 362 NGC 1851 NGC 2808 NGC 5139 (omega Cen NGC 5904 (M 5 NGC 5927 NGC 6266 (M 62 NGC 6341 (M 92 NGC 6362 NGC 6388 NGC 6397 NGC 6441 NGC 6535 NGC 6624 NGC 6656 (M 22 ) NGC 6681 (M 70) NGC 6715 (M ; proper motions; stars: kinematics and dynamics; stars: Population II; techniques: photometric
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/797/2/115
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