Bibcode
Aguerri, J. A. L.; Elias-Rosa, N.; Corsini, E. M.; Muñoz-Tuñón, C.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 434, Issue 1, April IV 2005, pp.109-122
Fecha de publicación:
4
2005
Revista
Número de citas
71
Número de citas referidas
61
Descripción
We have derived the photometric parameters for the structural components
of a sample of fourteen SB0 galaxies by applying a parametric
photometric decomposition to their observed I-band surface brightness
distribution. We find that SB0 bulges are similar to bulges of the
early-type unbarred spirals, i.e. they have nearly exponential surface
brightness profiles (< n>=1.48±0.16) and their effective
radii are strongly coupled to the scale lengths of their surrounding
discs (< r_e/h>=0.20±0.01). The photometric analysis alone
does not allow us to differentiate SB0 bulges from unbarred S0 ones.
However, three sample bulges have disc properties typical of
pseudobulges. The bulges of NGC 1308 and NGC 4340 rotate faster than
bulges of unbarred galaxies and models of isotropic oblate spheroids
with equal ellipticity. The bulge of IC 874 has a velocity dispersion
lower than expected from the Faber-Jackson correlation and the
fundamental plane of the elliptical galaxies and S0 bulges. The
remaining sample bulges are classical bulges, and are kinematically
similar to lower-luminosity ellipticals. In particular, they follow the
Faber-Jackson correlation, lie on the fundamental plane and those for
which stellar kinematics are available rotate as fast as the bulges of
unbarred galaxies.