The bulge-disk orthogonal decoupling in galaxies: NGC 4698 and NGC 4672

Details The bulge-disk orthogonal decoupling in galaxies: NGC 4698 and NGC 4672 The bulge-disk orthogonal decoupling in galaxies: NGC 4698 and NGC 4672

1999-02-18

arxiv.org/abs/astro-ph/9902271v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures (LaTeX, cupconf.sty). To appear in "The Formation of Bulges" C. M. Carollo, H. C. Ferguson, R. F. G. Wyse (

Scientific paper

We report the case of the geometrical and kinematical decoupling between the bulge and the disk of the Sa galaxy NGC 4698. The R-band isophotal map of this spiral shows that the bulge structure is elongated perpendicularly to the major axis of the disk. At the same time a central stellar velocity gradient is found along the major axis of the bulge. We also present the Sa NGC 4672 as good candidate of a spiral hosting a bulge and a disk orthogonally decoupled with respect to one other. This decoupling of the two fundamental components of a visible galaxy suggests that the disk could represent a second event in the history of early-type spirals.

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