CFHT UM2025 - Presentation Details
Abstract Details
Title: Feedback of Massive Stars on M33's Interstellar Medium with SITELLE
Presenter: Sylvain Raaijmakers
Abstract:
Feedback between stars and gas in galaxies is a crucial process that shapes galaxy evolution. Massive stars are a key element in this process. I will present the results of a study in which I used SITELLE, an imaging Fourier-transform spectrometer at the Canada-France-Hawaii telescope, to trace nebular emission lines over four 11”x11” field-of-views at sub-arcsecond resolution in the third largest galaxy in the local group, M33, with the aim of mapping the ionized gas. SITELLE datacubes cover key nebular spectral lines in the optical (H, [OIII], [OII], [NII], [SII]) enabling the study of the complex parsec-scale nebular structures ionized by hot, massive stars. I have identified close to one hundred spherically shaped nebulae with strong evidence of ionization by a single massive star at their center. I also find many ionized complexes of gas surrounding clusters or groups of stars. I combined the SITELLE datacubes with HST observations in 6 photometric bands ranging from the near-UV to the IR to characterize the ionizing source. I analyze the morphology, ionization structure and dynamical properties of these nebula and found them to be similar to the previously discovered wind-blown bubbles found around WR stars in M33.