Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-09
Astrophys.Space Sci. 277 (2001) 493-493
Astronomy and Astrophysics
Astrophysics
1 single page, 1 encapsulated figure. Poster contribution at the Euroconference "The Evolution of Galaxies. I- Observational c
Scientific paper
We present V-band surface photometry and major-axis kinematics of stars and ionized gas of three early-type spiral galaxies, namely NGC 772, NGC 3898 and NGC 7782. For each galaxy we built a self-consistent Jeans model for the stellar kinematics, adopting the light distribution of bulge and disc derived by means of a two-dimensional parametric photometric decomposition. This allowed us to investigate the presence of non-circular gas motions, and derive the mass distribution of luminous and dark matter in these objects. We found that the observed gas rotation corresponds to the circular velocity except for the innermost region (|r|<8") of NGC 3898. This behaviour is quite common, although not ubiquitous, in the few bulge-dominated galaxies, for which dynamical modeling allows the comparison between the gas velocity and the circular speed.
Beckman John E.
Bertola Francesco
Corsini Enrico Maria
J. Jose G. Funes S.
Pignatelli Ezio
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