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. Based on observations carried out at the Observatorio del Roque de los Muchachos, La Palma (Spain) with the Italian Telescopio Nazionale Galileo and at the European Southern Observatory, La Silla (Chile) (ESO 62.N-0463 and 67.B-0230). Tables 3 and 4 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/382/488
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2002
- DOI:
- 10.1051/0004-6361:20011647
- arXiv:
- arXiv:astro-ph/0110592
- Bibcode:
- 2002A&A...382..488C
- Keywords:
-
- GALAXIES: INDIVIDUAL: NGC 2855;
- GALAXIES: KINEMATICS AND DYNAMICS;
- GALAXIES: SPIRAL;
- GALAXIES: FORMATION;
- GALAXIES: STRUCTURE;
- Astrophysics
- E-Print:
- 7 pages, 4 PostScript figures. Accepted for pubblication in A&