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Stellar Dynamics in the Galactic Center: 1000 Stars in 100 Nights
Author(s) -
Ott Thomas,
Genzel Reinhard,
Eckart Andreas,
Schödel Rainer
Publication year - 2003
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200385080
Subject(s) - physics , stars , astrophysics , stellar population , galactic center , galaxy , sky , astronomy , spectrograph , very large telescope , telescope , stellar kinematics , population , milky way , star formation , spectral line , demography , sociology
We present the results of a largely automatized re‐analysis of all near‐infrared imaging data obtained with the MPE speckle camera SHARP I at the NTT. We were able to increase the number of measured proper motions in the Galactic Center stellar cluster by about an order of magnitude in comparison to previous work done on this issue. We have made astrometric positions and projected sky velocities available for about 1000 stars in the central parsec of our galaxy. We also present radial velocity measurements of 100 Stars which were obtained with the integral field spectrograph 3D at the 2.2 m ESO/MPG telescope located on La Silla, Chile. Finally, using the Gemini North science verification narrow band data enables us to distinguish the stellar populations to fainter magnitudes. Using this new and extensive dataset, we present an analysis of the dynamical properties of the late‐type and early‐type stellar populations. While the old population is relaxed and their movements isotropic, the young stars experience noticeable anisotropy with mainly tangential proper motions.