We measured a remarkable gas velocity gradient along the minor axis of a number of early-type spiral galaxies. This phenomenon suggests the presence of a kinematically-decoupled component in orthogonal rotation with respect to the galaxy disk which we named inner polar disk. If this is the case a second event has taken place in the history of the galaxy. Alternatively the gas velocity gradient is the result of non-circular motions induced by the potential of a triaxial bulge.
Inner polar disks in early-type spiral galaxies
COCCATO, LODOVICO;CORSINI, ENRICO MARIA;PIZZELLA, ALESSANDRO;
2003
Abstract
We measured a remarkable gas velocity gradient along the minor axis of a number of early-type spiral galaxies. This phenomenon suggests the presence of a kinematically-decoupled component in orthogonal rotation with respect to the galaxy disk which we named inner polar disk. If this is the case a second event has taken place in the history of the galaxy. Alternatively the gas velocity gradient is the result of non-circular motions induced by the potential of a triaxial bulge.
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