We report the case of the early-type disk galaxy NGC 4672 as a new example of a galaxy hosting a bulge and a disk, which are orthogonally decoupled with respect to one other. The morphological features of this galaxy are discussed as well as the velocity curves and velocity dispersions profiles of stars and ionized gas along both its major and minor axis. We concluded that NGC 4672 has structural (i.e. a bulge elongated perpendicularly to the disk) and kinematical (i.e. a stellar velocity gradient along the bulge major axis) properties similar to those of the Sa NGC 4698, in which the orthogonal rotation between the inner bulge and the disk has been recently found by Bertola et al. (1999). This bulge-disk orthogonal decoupling suggests that the disk component is the end result of a second event occurred in the history of the galaxy.
NGC 4672: a new case of an early-type disk galaxy with an orthogonally decoupled core
PIZZELLA, ALESSANDRO;BERTOLA, FRANCESCO;SARZI, MARC;CORSINI, ENRICO MARIA;CAPPELLARI, MICHELE;
2001
Abstract
We report the case of the early-type disk galaxy NGC 4672 as a new example of a galaxy hosting a bulge and a disk, which are orthogonally decoupled with respect to one other. The morphological features of this galaxy are discussed as well as the velocity curves and velocity dispersions profiles of stars and ionized gas along both its major and minor axis. We concluded that NGC 4672 has structural (i.e. a bulge elongated perpendicularly to the disk) and kinematical (i.e. a stellar velocity gradient along the bulge major axis) properties similar to those of the Sa NGC 4698, in which the orthogonal rotation between the inner bulge and the disk has been recently found by Bertola et al. (1999). This bulge-disk orthogonal decoupling suggests that the disk component is the end result of a second event occurred in the history of the galaxy.Pubblicazioni consigliate
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