Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-08-07
Astrophysical Journal Letters 702 (2009) L153-L157
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
6 pages, 5 figures Received 2009 May 2; accepted 2009 August 6; published 2009 August 24 in ApJ Letters Revision: Added author
Scientific paper
10.1088/0004-637X/702/2/L153
We present new results from BRAVA, a large scale radial velocity survey of the Galactic bulge, using M giant stars selected from the Two Micron All Sky Survey catalogue as targets for the Cerro Tololo Inter-American Observatory 4m Hydra multi-object spectrograph. The purpose of this survey is to construct a new generation of self-consistent bar models that conform to these observations. We report the dynamics for fields at the edge of the Galactic bulge at latitudes b=-8 deg. and compare to the dynamics at b=-4 deg. We find that the rotation curve V(r) is the same at b=-8 deg. as at b=-4 deg. That is, the Galactic boxy bulge rotates cylindrically, as do boxy bulges of other galaxies. The summed line of sight velocity distribution at b=-8 deg. is Gaussian, and the binned longitude-velocity plot shows no evidence for either a (disk) population with cold dynamics or for a (classical bulge) population with hot dynamics. The observed kinematics are well modeled by an edge-on N-body bar, in agreement with published structural evidence. Our kinematic observations indicate that the Galactic bulge is a prototypical product of secular evolution in galaxy disks, in contrast with stellar population results that are most easily understood if major mergers were the dominant formation process.
Clarkson Will
de Propris Roberto
Fux Roger
Howard Christian D.
Koch Andreas
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