The Orthogonal Gaseous Kinematical Decoupling in the Sa Spiral NGC 2855

Abstract

We present major and minor-axis kinematics of stars and ionized gas as well as narrow and broad-band surface photometry of the Sa spiral NGC 2855. In the nuclear regions of this unbarred and apparently undisturbed spiral galaxy the gas is rotating perpendicularly to the galaxy disk. We suggest that this kinematically-decoupled component is the signature of an acquisition process in the history of this galaxy.

7 pages, 4 PostScript figures. Accepted for pubblication in A&A. Figs. 1 and 3 at lower resolution. Data tables will be available at CDS

References in corpus (3)

• Growth of Galactic Bulges by Mergers: I. Dense Satellites
• The gas content of peculiar galaxies: counterrotators and polar rings
• The visible environment of galaxies with counterrotation

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