EDP Sciences
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Volume 382, Number 2, February I 2002
Page(s) 488 - 494
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011647

A&A 382, 488-494 (2002)
DOI: 10.1051/0004-6361:20011647

The orthogonal gaseous kinematical decoupling in the Sa spiral NGC 2855 $^{\bf ,}$

E. M. Corsini1, A. Pizzella2 and F. Bertola2

1  Osservatorio Astrofisico di Asiago, Dipartimento di Astronomia, Università di Padova, via dell'Osservatorio 8, 36012 Asiago, Italy
2  Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, 35122 Padova, Italy

(Received 2 September 2001 / Accepted 25 October 2001)

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.

Key words: galaxies: individual: NGC 2855 -- galaxies: kinematics and dynamics -- galaxies: spiral -- galaxies: formation -- galaxies: structure

Offprint request: E. M. Corsini, corsini@pd.astro.it

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