The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698
Open Access
- 10 July 1999
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 519 (2) , L127-L130
- https://doi.org/10.1086/312111
Abstract
The R-band isophotal map of the Sa galaxy NGC 4698 shows that the inner region of the bulge structure is elongated perpendicularly to the major axis of the disk; this is also true for the outer parts of the bulge if a parametric photometric decomposition is adopted. At the same time, the stellar component is characterized by an inner velocity gradient and a central zero-velocity plateau along the minor and major axes of the disk, respectively. This remarkable geometric and kinematic decoupling suggests that a second event occurred in the formation history of this galaxy.Keywords
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