E.M. Corsini 1,
A. Pizzella 2,
M. Sarzi 3,
P. Cinzano 3,
J.C. Vega Beltrán 4,
J.G. Funes S.J. 3,
F. Bertola 3,
M. Persic 5 and
P. Salucci 6
Received 8 June 1998 / Accepted 3 November 1998
We present the stellar and ionized-gas velocity curves and velocity-dispersion profiles along the major axis for six early-type spiral galaxies.
Two of these galaxies, namely NGC 2179 and NGC 2775, are particularly suited for the study of dark matter halos. Using their luminosity profiles and modeling their stellar and gaseous kinematics, we derive the mass contributions of the luminous and the dark matter to the total potential. In NGC 2179 we find that the data (measured out to about the optical radius ) unambiguously require the presence of a massive dark halo. For the brighter and bigger object NGC 2775, we can rule out a significant halo contribution at radii . Although preliminary, these results agree with the familiar mass distribution trend known for late-type spirals of comparable mass.
Key words: galaxies: individual: NGC 2179 galaxies: individual: NGC 2775 galaxies: kinematics and dynamics galaxies: spiral cosmology: dark matter
* Based on observations carried out at ESO, La Silla (Chile) (ESO N. 52, 1-020) and on observations obtained with the VATT: the Alice P. Lennon Telescope and the Thomas J. Bannan Astrophysics Facility.
Send offprint requests to: E.M. Corsini
Correspondence to: (email@example.com)
© European Southern Observatory (ESO) 1999
Online publication: February 23, 1999