A High Precision Radial Velocity Survey of the Galactic Bulge

Details A High Precision Radial Velocity Survey of the Galactic Bulge A High Precision Radial Velocity Survey of the Galactic Bulge

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917206h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #172.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We are undertaking a large scale radial velocity survey of the Galactic bulge, using M giant stars selected from the 2MASS catalog as radial velocity probes. Here we report 29 fields with Galactic longitudes from -10 degrees to +10 degrees and Galactic latitudes +5 degrees to -5 degrees, with each field containing 100 stars. We find a bulge rotation of +/-50 km/sec out to +/-10 degrees Galactic longitude, slower than that predicted by the dynamical model of Zhao (1996). However, our velocity dispersion profile is in agreement with the Zhao model. The high precision of our survey ( 5km/s) has produced an unexpected result: cold kinematic features are seen in a number of the radial velocity distributions.

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