Proper motions for HST observations in three off-axis bulge fields
نویسندگان
چکیده
منابع مشابه
HST / WFPC 2 proper motions in two bulge fields : kinematics and stellar population of the Galactic bulge
We report proper motion dispersions for stars in the direction of two fields of the Galactic bulge, using HST/WFPC2 images taken six years apart. Our two fields are Baade’s Window (l, b) = (1.13◦,−3.77◦) and Sgr I (l, b) = (1.25◦,−2.65◦). Our proper motion dispersions are in good agreement with prior groundand space-based proper motion studies in bulge fields, but in contrast to some prior stud...
متن کاملWFPC 2 proper motions in two bulge fields : kinematics and stellar population of the Galactic bulge
We report proper motion dispersions for stars in the direction of two fields of the Galactic bulge, using HST/WFPC2 images taken six years apart. Our two fields are Baade’s Window (l, b) = (1.13◦,−3.77◦) and Sgr I (l, b) = (1.25◦,−2.65◦). Our proper motion dispersions are in good agreement with prior groundand space-based proper motion studies in bulge fields, but in contrast to some prior stud...
متن کاملStellar Proper Motions in the Galactic Bulge from deep HST ACS / WFC
We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted for more than 180,000 objects, with >81,000 measured to accuracy better than 0.3 mas yr in both coordinates. We report several results based on these measurements: 1. Kinematic separation of bulge from disk allows a s...
متن کاملStellar Kinematics of the Bulge from HST Proper Motion Measurements
I report on an ongoing programme of proper motion measurements in the Galactic Bulge, using HST images. As a first application, the data are used to derive the vertical gravitational acceleration on the minor axis of the Galaxy. Implications of the measurement for the flattening of the Galactic potential are discussed.
متن کاملMapping stellar kinematics across the Galactic bar : HST measurements of proper motions in 35 fields . ⋆
We present a proper motion mini-survey of 35 fields in the vicinity of Baade window, (l, b) = (1◦,−4◦), sampling roughly a 5 × 2.5 deg region of the Galactic bar. Our second epoch observations collected with the ACS/HRC instrument on board the Hubble Space Telescope were combined with the archival WFPC2/PC images. The resulting time baselines are in the range of 4–8 years. Precise proper motion...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201117339