Bibcode
de Lorenzo-Cáceres, A.; Falcón-Barroso, J.; Vazdekis, A.; Martínez-Valpuesta, I.
Referencia bibliográfica
Highlights of Spanish Astrophysics V, Astrophysics and Space Science Proceedings. ISBN 978-3-642-11249-2. Springer-Verlag Berlin Heidelberg, 2010, p. 279
Advertised on:
2010
Número de citas
0
Número de citas referidas
0
Descripción
We present SAURON stellar kinematical analysis for four double-barred
early-type galaxies: NGC 2859, NGC 3941, NGC 4725 and NGC 5850. The
presence of the inner bar is not evident from the radial velocity, but
it appears to have an important effect in the stellar velocity
dispersion maps: we find two σ-hollows of amplitudes between 10
and 40 km s- 1 at either sides of the center, at the
ends of the inner bars. We have performed numerical simulations to
explain these features. Ruling out other possibilities, we finally
conclude that, although the σ-hollows might be originated by a
younger stellar population component with low velocity dispersion. More
likely they are an effect of the contrast between two kinematically
different components: the bulge, with its high velocity dispersion, and
the inner bar, characterized by its low velocity dispersion (ordered
motion).