Galaxias lenticulares: sus propiedades y la relación Tully-Fisher

O´MILL, ANA LAURA; BORNANCINI, CARLOS; MOSCONI, MIRTA

Boletin de la Asociacion Argentina de Astronomia

Asociación Argentina de Astronomía

Lugar: La Plata; Año: 2002 vol. 45 p. 80 - 81

1669-9521

We investigate some properties of S0, E, Sa and Sb galaxies, in order to compare morphological characteristics, their luminosities and dynamics. From the observational data we have derived integrated colours and luminosity distributions, which would confirm that S0 are not intermediate between E and Sa galaxies. The Tully-Fisher relation in the I-band shows a similar behaviour between late-type spiral galaxies and S0 galaxies in clusters, showing a dispersion of σ ∼ 0.3 mag. This could suggest that S0 galaxies in clusters could come from spiral galaxies that have lost their gas by tidal stripping. For field S0 galaxies the dispersion in the same I-band rises to σ ∼ 0.7 mag, compared to that of spiral galaxies (σ ∼ 0.3 mag). It is concluded that S0 galaxy type does not represent an intermediate type between E and Sa galaxies, which suggest various ranges of formation history.