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 R _ { opt } ) 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 R \la 0.6 R _ { opt } .
Although preliminary , these results agree with the familiar mass distribution trend known for late-type spirals of comparable mass .

1 Parameters of the sample galaxies . Table 1 Parameters of the sample galaxies .
[Table Here]
NOTES – Col. ( 2 ) : classification from RSA ( Sandage & Tamman 1981 ) .
Col. ( 3 ) : classification from RC3 ( de Vaucouleurs et al .
1991 ) .
Col. ( 4 ) : total observed blue magnitude from RC3 except for IC 724 ( RSA ) .
Col. ( 5 ) : observed position angle .
Col. ( 6 ) : inclination from Rubin et al .
( 1985 ) except for NGC 2179 ( Tully 1988 ) .
Col. ( 7 ) : heliocentric velocity of the galaxy derived as center of symmetry of the gas RC .
Col. ( 8 ) : systemic velocity derived from V _ { \odot } corrected for the motion of the Sun with respect of the Local Group by \Delta V = 300 \cos { b } \sin { l } .
Col. ( 9 ) : distance obtained as V _ { 0 } / H _ { 0 } with H _ { 0 } = 75 km s ^ { -1 } Mpc ^ { -1 } .
Col. ( 11 ) : radius of the 25 B - mag arcsec ^ { -2 } isophote from RC3 .
Col. ( 12 ) : radius of the farthest measured stellar velocity .
Col. ( 13 ) : radius of the farthest measured gas velocity .
Col. ( 14 ) : total integration time of the spectroscopic observation .