Searching for star-forming early-type galaxies: the role of the environment — Laurie Riguccini (OV/UFRJ)
31 de maio: 12:30 - 13:30
ETGs were first believed to be read and dead but studies from the past decades have indicated that some ETGs show signs of star formation. Where does this star formation(SF) come from?
Riguccini et al. (2015) unveiled a population of galaxies in transition: star-forming ETGs in the Coma cluster with a larger L24μm/LK ratio. They have shown that 70% of those star-forming ETGs are located in a the south-west part of the cluster, where a substructure is unfailing on the main cluster. In order to apply this mid-IR/near-IR selection to a wide sample of ETGs, we already checked the validity of using the WISE-all sky survey bands instead of the Sptizer-24μm/2MASS_K band ratio. We successfully found that using WISE 22μm/3.4μm is a reliable tool to select star-forming ETGs.
We aim at understanding what happened in those ETGs to have a new burst of star formation and to built large samples of these objects. We aim to unveil star-forming ETGs in other clusters and explore the effect of the environment on their SF activity using the most populated clusters in the local Universe and expend it to wide survey such as the S-PLUS survey.