[Todos] IAFE CICLO DE COLOQUIOS CIENTIFICOS:JUEVES 16 de Octubre a las 14hs.

["Area Difusión IAFE"]

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                     CICLO DE COLOQUIOS CIENTÍFICOS
                        ¿Qué se investiga en el IAFE?
                  Instituto de Astronomía y Física del Espacio
                                CONICET-UBA

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  "A kinematic analysis of Hickson Compact Group galaxies and a study of
metallicity gradients in interacting systems."

                        Sergio Torres Flores
            Departamento de Física de la Universidad de La Serena
                  Jueves 16 de Octubre de 2014 a las 14:00 hs.
                       Aula del Edificio IAFE

Nearby compact groups of galaxies are ideal laboratories to study
galaxy-galaxy interactions. In this sense, the study of nearby interacting
galaxies can help us in the interpretation of high-redshift galaxies,
where the interaction events were more common. In this talk, I will
present some kinematic results obtained for a sample of about 20 Hickson
Compact Group (HCG) of galaxies. Using Fabry-Perot data, we have analysed
the kinematic of galaxies in these systems and we have found that HCG
galaxies display complex kinematics. Most of the galaxies in these systems
present perturbed rotation curves and misalignment between optical and
kinematic position angles. In order to determine if the environment can
play a role in the analysis of the Tully-Fisher relation, we have analysed
the near-infrared, stellar and baryonic Tully-Fisher relation for a sample
of HCG galaxies and we compared it with the relations defined by
non-interacting galaxies (from the GHASP sample). We found that some
interacting galaxies do not follow the Tully-Fisher relation defined by
the GHASP sample. The position of these galaxies in the Tully-Fisher
relation can be explained by recent burst of star formation. These results
will be discussed during the talk. In addition, I will show some recent
results that we have obtained in a program devoted to determine
metallicity gradients in the tidal tails of interacting galaxies. In this
case we have found some flats metallicity distributions, which are
consistent with the results obtained by galaxy simulations