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The sources of Ionisation for the gas of Early-Type Galaxies

Marc Sarzi, University of Hertfordshire

Évènements associés

  • Le lundi 17 mai 2010 de 11:00 à 12:00 - lieu : Salle 108, Batiment des Communs, Meudon

Early-type galaxies are now known to also contain a rich and complex interstellar medium. I will discuss how with SAURON integral-field observations we can understand what powers the nebular emission that most often gives away the presence of such a medium. In particular, I will show that central AGNs can only ionize the gas in the central regions of early-type galaxies, a finding that has strong repercussions for our understanding of AGN activity in large spectroscopic samples such as provided by the Sloan Digital Sky Survey.