SEMINARIO (auditorio CAB): "Stellar populations in disk galaxies from the CALIFA survey. The influence of bars"

Ponente: Patricia Sánchez-Blázquez, Universidad Autónoma de Madrid

4 de abril de 2014, 12:00h

Auditorio Centro de Astrobiologia (CSIC-INTA)

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Instituto Nacional de Técnica Aeroespacial
Ctra de Ajalvir, km 4
28850 Torrejón de Ardoz, Madrid

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Título: Stellar populations in disk galaxies from the CALIFA survey. The influence of bars

Resumen: Numerical simulations have shown that strong gravitational torque by non-axisymmetric components -- in particular bars-- induce evolutionary processes such as redistribution of mass and angular momentum in the galactic disks and a consequent change of chemical abundance pro?les. The redistribution of stellar disk material in?uences the interpretation of various critical observed metrics of Galaxy evolution, including the age-metallicity relation in the solar neighborhood and the local G-dwarf metallicity distribution.

However, despite an increased number of theoretical works agree about the importance of stellar radial migrations for shaping disk galaxies - it is found that > 50% of stars on mostly circular orbits in the solar neighborhood have come from elsewhere -- there is still a lack of observational evidence probing or quantifying the importance of this process.

I will present star formation histories and the stellar metallicity gradients in the disk of a sample of nearby galaxies from the Calar Alto Legacy Integral Field Area Survey (CALIFA). By comparing these gradients in galaxies with and without bars we aim to quantify the redistribution of mass and angular momentum in the galactic disks due to bars.

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