Born at the same time?

• Main Authors: Santucci, Giulia, None
• Format: Still Image
• Language: unknown
• Published: Zenodo 2019
• Subjects: sami
• Online Access: https://dx.doi.org/10.5281/zenodo.2635377; https://zenodo.org/record/2635377

The brightest galaxies of groups and clusters are extremely luminous galaxies, usually located in the centres of those systems – central galaxies. In the hierarchical scenario of structure formation, galaxies grow in mass and size by merging with their neighbours. Simulations predict that central galaxies have higher merger rates than other similarly luminous early type galaxies, mostly due to their privileged position at the bottom of the gravitational potential of the cluster. The recent accretion history of galaxies can be read through their stellar population gradients. Therefore, central galaxies with active merger histories are predicted to have shallower metallicity gradients than satellite galaxies of a similar mass. We are examining the stellar population gradients (age and metallicity) of 445 central galaxies in the SAMI galaxy survey to determine whether they are offset from similarly massive satellite galaxies in order to reach a better understanding of their formation and evolution history.