8-12 juin, 2014


Spiral galaxy evolution as seen with SpIOMM

Laurie Rousseau-Nepton (Université Laval)

Carmelle Robert

With SpIOMM, the Imaging Fourier transform spectrometer of the Observatoire du Mont-Mégantic, we obtained simultaneously thousands of spectra over the whole surface of 7 nearby spiral galaxies. These data are ideal to study the emission lines in the visible from the bright HII regions. Our sample of galaxies contains different morphology types, from Sb to Sd, and includes barred and non barred spirals. For these objects, we measured the size and luminosity of the ionized regions, as well as the gas metallicity and density. Among others, we looked for gradients along the galaxy radius and searched for relations with the galaxy structures (arms and bar) and with the galaxy morphology. These first results represent important clues in a project aiming at a detailed study of stellar populations that will be used to rebuild the history of spiral galaxies and to identify the relative importance and efficiency of the different mechanisms responsible for their evolution.
(doit être confirmé par le SOC)