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Title:
Proper motion dispersions of red clump giants in the galactic bulge: observations and model comparisons
Authors:
Rattenbury, Nicholas J.; Mao, Shude; Debattista, Victor P.; Sumi, Takahiro; Gerhard, Ortwin; de Lorenzi, Flavio
Affiliation:
AA(University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL), AB(University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL), AC(Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580, USA), AD(Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan), AE(Max-Planck-Institut fuer extraterrestrische Physik, PO Box 1312, D-85741 Garching, Germany), AF(Max-Planck-Institut fuer extraterrestrische Physik, PO Box 1312, D-85741 Garching, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 378, Issue 3, pp. 1165-1176. (MNRAS Homepage)
Publication Date:
07/2007
Origin:
MNRAS
MNRAS Keywords:
gravitational lensing, Galaxy: bulge, Galaxy: centre, Galaxy: kinematics and dynamics, Galaxy: structure
DOI:
10.1111/j.1365-2966.2007.11851.x
Bibliographic Code:
2007MNRAS.378.1165R

Abstract

Red clump giants (RCGs) in the Galactic bulge are approximate standard candles and hence they can be used as distance indicators. We compute the proper motion dispersions of RCG stars in the Galactic bulge using the proper motion catalogue from the second phase of the Optical Gravitational Microlensing Experiment (OGLE-II) for 45 fields. The proper motion dispersions are measured to a few per cent accuracy due to the large number of stars in the fields. The observational sample comprises 577736 stars. These observed data are compared to a state-of-the-art particle simulation of the Galactic bulge region. The predictions are in rough agreement with observations, but appear to be too anisotropic in the velocity ellipsoid. We note that there is significant field-to-field variation in the observed proper motion dispersions. This could either be a real feature, or due to some unknown systematic effect.
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