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2011MNRAS.413.1875N - Mon. Not. R. Astron. Soc., 413, 1875-1888 (2011/May-3)
Two-dimensional hα kinematics of bulgeless disc galaxies.
NEUMAYER N., WALCHER C.J., ANDERSEN D., SANCHEZ S.F., BOKER T. and RIX H.-W.
Abstract (from CDS):
Due to the complexities of the velocity fields, we obtain reliable determinations of the kinematic centre for only six of our 20 sample galaxies. For all of these, the locations of the nuclear star cluster/photometric centre and the kinematic centre agree within the uncertainties. These locations also agree for seven more objects, despite considerably larger uncertainties as to the accuracy of the kinematic centre. If we disregard all kinematically irregular galaxies, our study concludes that nuclear star clusters truly occupy the nuclei, or dynamical centres, of their hosts. Our results are thus consistent with in situ formation of nuclear star clusters. Yet, many well-motivated formation scenarios for nuclear clusters invoke off-centre cluster formation and subsequent sinking of clusters due to dynamical friction. In that case, our results imply that dynamical friction in the centres of bulgeless galaxies must be very effective in driving massive clusters to the kinematic centre.
Abstract Copyright: 2011 The Authors. Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): techniques: imaging spectroscopy - galaxies: bulges - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: spiral - galaxies: starclusters: general
Simbad objects: 21
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