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25 April 2024 |
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Kinematics at the Edge of the Galactic Bulge: Evidence for Cylindrical Rotation | | Christian D. Howard
; R. Michael Rich
; Will Clarkson
; Ryan Mallery
; John Kormendy
; Roberto De Propris
; Annie C. Robin
; Roger Fux
; David B. Reitzel
; HongSheng Zhao
; Konrad Kuijken
; | | Date: |
7 Aug 2009 | | Abstract: | We present new results from BRAVA, a large scale radial velocity survey of
the Galactic bulge, using M giant stars selected from the 2MASS catalogue as
targets for the CTIO 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. | | Source: | arXiv, 0908.1109 | | Services: | Forum | Review | PDF | Favorites | |
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