Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-23
Astrophys.J. 643 (2006) 200-209
Astronomy and Astrophysics
Astrophysics
25 pages, 8 figures, accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/501520
We have obtained high angular resolution, high signal-to-noise spectra of the Calcium triplet absorption lines on the photometric axes of the stellar spheroid in the polar disk galaxy NGC4650A. Along the major axis, the observed rotation and velocity dispersion measurements show the presence of a kinematically decoupled nucleus, and a flat velocity dispersion profile. The minor axis kinematics is determined for the first time: along this direction some rotation is measured, and the velocity dispersion is nearly constant and slightly increases at larger distances from the center. The new high resolution kinematic data suggest that the stellar component in NGC4650A resembles a nearly-exponential oblate spheroid supported by rotation. The main implications of these results on the previous mass models for NGC4650A are discussed. Moreover, the new kinematic data set constraints on current models for the formation scenarios of Polar Ring Galaxies (PRGs), supporting a slow accretion rather then a secondary strong dissipative event.
Arnaboldi Magda
Bournaud Frederic
Capaccioli Massimo
Combes François
Freeman Ken C.
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