NGC 4672: a new case of an early-type disk galaxy with an orthogonally decoupled core

Details NGC 4672: a new case of an early-type disk galaxy with an orthogonally decoupled core NGC 4672: a new case of an early-type disk galaxy with an orthogonally decoupled core

2000-06-21

arxiv.org/abs/astro-ph/0006296v1

Astronomy and Astrophysics

Astrophysics

9 pages, 6 PostScript figures. Accepted for pubblication in A&A

Scientific paper

We report the case of the early-type disk galaxy NGC 4672 as a new example of a galaxy characterized by the orthogonal geometrical decoupling between bulge and disk. The morphological features of this galaxy are discussed as well as the velocity curves and velocity dispersion profiles of stars and ionized gas along both its major and minor axis. We conclude that NGC 4672 has structural (i.e., a bulge elongated perpendicularly to the disk) and kinematical (i.e., a stellar core rotating perpendicularly to the disk) properties similar to those of the Sa NGC 4698. The presence of the isolated core suggests that the disk component is the end result of the acquisition of external material in polar orbits around a pre-existing oblate spheroid as in the case of the ring component of AM 2020-504, the prototype of polar ring ellipticals.

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