The bulge-disk orthogonal decoupling in galaxies: NGC 4698 and NGC 4672
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/9902271,
title = {The bulge-disk orthogonal decoupling in galaxies: NGC 4698 and NGC 4672},
author = {F. Bertola and E. M. Corsini and M. Cappellari and J. C. Vega Beltran and A. Pizzella and M. Sarzi and J. G. Funes},
journal= {arXiv preprint arXiv:astro-ph/9902271},
year = {2007}
}
Comments
4 pages, 3 figures (LaTeX, cupconf.sty). To appear in "The Formation of Bulges" C. M. Carollo, H. C. Ferguson, R. F. G. Wyse (eds.), Cambridge University Press